The bronze plaques of the Hall of Famers that hang in the gallery in Cooperstown could be considered the ultimate baseball cards, though obviously no collector (not even Keith Olbermann) can collect them. The closest we can come is by collecting the classic Hall of Fame plaque postcards – a living set (predating the Topps Living Set by several decades) that is augmented each year by the annual class of new Hall of Famers.
A subset of the Hall of Fame plaque postcards that I’ve enjoyed collecting over the years is the variations created when one of the original bronze plaques is replaced by a new, altered plaque (and that new plaque is then reproduced on a postcard).
By my count, at least 17 original plaques have been replaced over the years by altered versions (with changes to the likeness, name or text), including one that’s been changed at least twice, and another that’s been changed at least three times. This is only an informal survey, based on my examinations of the plaques currently on display in the Hall, photographs from induction ceremonies, my collection of Hall of Fame plaque postcards, and readers’ responses to the original posting of this article (which alerted me to the Ruth, Barrow, Lemon and Fisk variations). I inquired at the Hall of Fame library about (1) any sort of official list of changed plaques and (2) any archived correspondence regarding the when and why of the changes made, but was told (1) that there was no such official list and (2) that any such internal correspondence was not available for public view.
Here’s what I’ve got as of April 2020:
BABE RUTH
As strange as it may sound, what must be the most-read plaque in the Hall and, I’m guessing, the best-selling plaque postcard every year, originally had the wrong year for Ruth’s major league debut — an error that went uncorrected for nearly 70 years! Ruth’s incorrect career span of “1915-1935” on his original plaque was changed to the correct “1914-1935” at some point in late 2005 or 2006. (Thanks to Jimmy Seidita for pointing out the change in Ruth’s plaque and for the link in his comment below to a 2005 New York Times article about the plaques.)

ED BARROW
The likeness on Ed Barrow’s original plaque was changed sometime between 1954 and 1959 – this is the earliest change in a plaque that I’ve found. Elected by the Veterans’ Committee in late 1953, Barrow was formally inducted (and his original plaque likely made its public debut) at the following summer’s ceremony with the Class of 1954. The original plaque appears on Artvue Type 1 (no bolts) postcards (produced from 1953-1955), but I haven’t been able to find the original on an Artvue Type 2 (produced from 1956-1963), so the change may have happened prior to 1956. I do have a Hall of Fame guidebook published in July 1959 that shows the replacement plaque. (Thanks to Adam Penale for pointing out the change in Barrow’s plaque.)
Author’s question: Is there an Artvue Type 2 postcard showing the original Barrow plaque?

Jackie Robinson
Even given the limited space on the plaques for describing an inductee’s achievements, the Hall has made some curious editorial choices over the years when composing the text (Barry Larkin’s plaque fails to mention his 1995 NL MVP award, for example), but no omission was more glaring than the fact that Jackie Robinson’s original plaque made no mention of his integration of the major leagues. His 1962 plaque (left) was replaced in 2008 with an altered version of the text (right) that remedied that situation. There’s a discussion of the change on the Hall’s website.

Bob Feller
It appears that Feller’s plaque has been changed at least three times. His original plaque from 1962 (top left in the photo below, on an Artvue postcard) was later replaced by a plaque with two changes: a different likeness, and his winning percentage in the last line of text erroneously changed from “P.C..621” to “P.C.,621” (top right, on a Curteichcolor green-back). That second version was replaced by a third version that had his career years listed as “1936-1956” and maintained the “,621” error (lower left, on a Mike Roberts postcard printed in 1992). Subsequently, that third version was itself replaced with a new plaque that shows (as the first two versions of his plaque did) his career years as “1936-1941” and “1945-1956” (reflecting the gap in his baseball career due to his military service) and corrects the “,621” to “.621” (lower right, on the current Scenic Art postcard).

Ted Williams
It appears that Teddy Ballgame’s plaque has been changed at least twice. The original plaque that was displayed at his 1966 induction ceremony was subsequently replaced by a plaque bearing a slightly different likeness (on the left in the photo below). That replacement plaque was itself later replaced by a new plaque (on the right) with a drastically different likeness. As to why the changes were made, I note the following from Thomas Boswell in The Washington Post on August 9, 1977: “Ted Williams was so incensed by his nonlikeness that he demanded a new plaque.”
A picture of Williams posing (at his 1966 induction ceremony) with his original plaque can be seen accompanying an article on the Hall’s website.
Author’s question: Was a Hall of Fame postcard produced depicting the original 1966 Ted Williams plaque?

Stan Musial
Musial’s original 1969 plaque was replaced by one with a slightly changed text, including the replacement of “SLUGGING PERCENTAGE 6 YEARS” with “AND WON SEVEN N.L. BATTING TITLES.”

Roberto Clemente
Clemente’s original 1973 plaque was replaced in 2000 in order to reflect the traditional Latin American presentation of his full name (whereby his given last name is followed by his mother’s maiden name). Juan Marichal’s original plaque was replaced to make a similar change (see below). The original Clemente plaque is on display in the kids’ section of the Museum (in the original Hall of Fame library building) – as far as I know, it is the only one of the replaced plaques on public display anywhere (though the Hall’s website says the original Jackie Robinson plaque remains “a part of the Museum’s collections and will be used for educational purposes”).

Warren Spahn
Spahn’s original 1973 plaque was replaced by one showing a corrected career strikeout total of 2,583 in the next-to-last line of the text.

BOB LEMON
Lemon’s original 1976 plaque showed his career years as “1941-1942 AND 1946-1958,” which reflected the gap in his career due to military service in WWII. His original plaque was subsequently replaced with one showing his career years as “1941-1958.” (Thanks to Rick McElvaney for pointing out the change in Lemon’s plaque.)

Robin Roberts
I’m curious as to the “why” on this one. Instead of a slight emendation to correct the erroneous reference on Roberts’s original 1976 plaque to his having led the league in shutouts twice (he actually led the league once), the replacement plaque bears a wholesale change to the text, including a new and mysterious reference to his having been “MAJOR LEAGUE PLAYER OF THE YEAR, 1952 AND 1955.” Assuming the award being referred to is The Sporting News Major League Player of the Year Award, the information on the replacement plaque is incorrect – Roberts did win that award in 1952, but Duke Snider won it in 1955 (Roberts did win The Sporting News Pitcher of the Year Award in 1952 and 1955).

Editor’s Note: Mr. James Roberts, the youngest son of the Hall of Fame pitcher, reached out to us to explain the reason for the plaque’s update:
“You say it is curious as to ‘why’ on Roberts. On the original it said ‘while usually playing for second division teams.’ He did not like that, he felt his teammates were being disparaged. He requested the change. Now you know why.
Juan Marichal
As with Clemente’s plaque (see above), Marichal’s original plaque was replaced to reflect the traditional Latin American presentation of his full name.

George Davis
The original 1998 plaque for Davis was later replaced to correct the years he served as player manager in the last line of the text, from “1898, 1900 and 1901” to “1895, 1900 and 1901.” The replacement plaque has not been reproduced on a postcard yet – possibly because they still haven’t sold through the original July 1998 print run! Based on how many “Date of Printing July 1998” Davis postcards were available on the rack during my most recent visit to the Hall’s gift shop in October 2019, we may be many years away from a new printing of his postcard (which would presumably show the replacement plaque).

CARLTON FISK
Fisk’s original 2000 plaque was replaced to change his number of games caught (in the second line of the text) from 2,229 to 2,226. (Thanks to Wayne McElreavy for pointing out the change in Fisk’s plaque.)
Pete Hill
Hill’s original 2006 plaque was replaced to correct his first name: “JOSEPH” was changed to “JOHN.”

Bruce Sutter
Sutter’s original 2006 plaque was replaced to correct a typographical error: in the sixth line of the text, “LEAD” was changed to “LED.”

Roberto Alomar
Alomar’s original 2011 plaque was replaced by a new one with a slightly different likeness.

Ron Santo
Santo’s original 2012 plaque was replaced by a new one with a slightly different likeness.

Bullet Rogan – possible future change
The 2019 Hall of Fame Almanac correctly lists Rogan’s full name as “Charles Wilber ‘Joe’ Rogan,” but, as of the time of this writing, his plaque (as well as the Hall of Fame’s website) shows his full name incorrectly as “Wilber Joe Rogan.” I’ve got my eye on this one…
UPDATE (JULY 2020): the Hall of Fame has changed Rogan’s page on the official HOF website to show his name as “Charles Wilber Rogan” — could a corresponding change of his plaque be in the offing? Watch this space!

As mentioned above, this list reflects only my personal, informal survey and is quite possibly incomplete — additional information from readers would be most welcome!