The 1975 penny with "12 31 74" stamped on it is likely a form of post-mint alteration, where someone intentionally applied the date to the coin. This practice can be done for various reasons, such as creating a novelty item, marking a personal event, or for artistic purposes. Such altered coins can attract collectors' interest, especially if the alterations are unique or well-executed. However, it's important to note that these modifications can decrease the coin's numismatic value as a collectible.
Good Morning America - 1975 2011-10-31 was released on: USA: 31 October 2011
Good Morning America - 1975 1978-07-31 was released on: USA: 31 July 1978
Good Morning America - 1975 1978-01-31 was released on: USA: 31 January 1978
The Night That Panicked America - 1975 TV was released on: USA: 31 October 1975 Finland: 27 October 2008
Democracy Now - 2001 2012-12-31 was released on: USA: 31 December 2012
It's an ordinary 1975 cent that a private organization overpunched and handed out to celebrate the law that allowed private gold ownership. It has no extra value to collectors, though.
It's the date that it became legal to own gold again after 40 some years. It was a publicity thing from the government to commemorate the legal right to own gold. See this YouTube video: http://www.youtube.com/watch?v=QssI_rTmQLs
The Tonight Show Starring Johnny Carson - 1962 1975-12-31 was released on: USA: 31 December 1975
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The Robert MacNeil Report - 1975 2012-12-31 was released on: USA: 31 December 2012
The Robert MacNeil Report - 1975 2013-12-31 was released on: USA: 31 December 2013
The Robert MacNeil Report - 1975 2010-12-31 was released on: USA: 31 December 2010
The Robert MacNeil Report - 1975 2003-12-31 was released on: USA: 31 December 2003
Good Morning America - 1975 1993-12-31 was released on: USA: 31 December 1993
This was a post-mint modification of the penny. Any such modification destroys virtually all collector's value. It may not even be accepted in all places of business as legal tender.
Seamo was born on 1975-12-31.
The counter stamped date was not done by the US Mint and adds no value at all to the coin. The coin is worth one cent unless you find someone that wants it.