Interesting Prototype? Salesman Sample? Franklin Mint 1975 Gold 100 Balboa

Apologies if this is posted in the wrong section.
I was wondering if anybody has seen something like this? The diameter is 26mm & the front of the coin looks like a genuine coin. The reverse appears to be reversed & incused? I was able to come across an archived ebay listing from around 2018 where it was said to have sold for $1500, I can not confirm whether this was just an asking price that was never met or is an actual sell price. Below is the description from the sale.
Note - the ad says he believed it to be unique but that cant be true because I think I have one.

1975 Panama 100 Balboas "Gold" GOLD PLATED PROTOTYPES Embedded In Lucite By The Franklin Mint As a Presentation Piece. This Unique Pair of Uniface Coins was given to me in 1974 by the Franklin Mint before the official release of the first "new" (post-1933) Gold Coins produced for legal distribution in the United States. As far as I know, these are the only prototypes of the 1975 Panama 100-Balboa Gold Coin ever produced.The diameter and thickness of each coin prototype is identical to the actual coin. However, I do not believe these uniface patterns are made of gold. They appear to be Gold Plated, but I do not know exactly how they were minted.* As shown in the photos one coin was struck as an "obverse specimen", the other as a "reverse specimen" displayed side-by-side in a 4" x 2-1/4" slab of lucite that is 3/8" thick. These Proof Coins have a reeded edge and you can touch and feel the flat surface of the reverse of each coin which appears to be copper or bronze.*

The coins were apparently inserted into 2 circular slots cut into the lucite. Additional information may be available from the Franklin Mint archives. My only guarantee is that all of the information stated above is accurate. I have no idea how the coins can be removed from the lucite in order to be certified by PCGS or NGC. In my professional opinion, from a historical perspective they should remain intact. A very interesting numismatic rarity for your collection.

This is in response to a request for more information about the above coins (this request was not made by me but another, and was part of the sellers description): Thank you for your interest in the Panama 100-Balboas prototype. It's a very unusual artifact and I wish I knew more about it. As I mentioned, it was given to me as a gift in 1974 when I was Numismatic Director of the Rockefeller Center, New York office of Perera Fifth Avenue, a leading foreign exchange bank with 50 offices worldwide. Like the Franklin Mint, Deak-Perera has since gone out of business. Any records at Deak-Perera are probably lost or hard to find. In 2013, Sequential Brands acquired the Franklin Mint and its intellectual properties. I do not know anyone at Sequential and I have no idea if they would be receptive to an inquiry about the Panama prototype. Nor do I recall why this numismatic rarity was given to me as a gift. In 1974 the Franklin Mint and Deak-Perera had some kind of business relationship.

One day, as the day of Gold re-legalization approached, I recall being given the two uniface coins embedded in lucite (something the Franklin Mint has done) and told that the Franklin Mint was promoting the new Panama Gold Coins that were scheduled for release on 12/31/74 or 1/1/75. It was a crazy time, and I simply held on to the coins. I don't remember who gave me the coins, and I don't know if there was any documentation. I have never seriously researched the background of the coins. There may or may not be any official records of these coins or why they are in lucite. Perhaps someone at the American Numismatic Association or Coin World could help you learn more about them.

Photos of mine, note the major scratches on the reverse appear to be on a thin layer of lucite above the coin and not on the coin itself.