What Rick is showing you is his first reported, discovery specimen of a variety of coins known as doubled dies, or in his specific case, Class II Tripled Die Obverse (TDO). The IkeGroup has their selected varieties, including doubled dies, and are known as DIVAs. Think of them as the Cherrypicker's Guide to Ikes. Actually, some DIVAs are in the newest CPG (the FEV for example). What is shown in the above is from Ike Dollar Doubled Die, or IDDD, and is a site which documents almost every major/minor/obscure varieties of Ikes' doubled dies. PCGS as a grading company will only attribute varieties found in the Red Book and CPG to my knowledge and ANACS will attribute basically anything. Hope this helps! PS-You can get good close-up photos with a smart phone and a macro attachment which sells on ebay for about $10 or you can buy a USB scope (overkill imo unless you want to look for these varieties yourself) for about $20 and it zooms to ~200x if memory serves. I haven't used mine in a while to be honest.
I have a scope, but IDDD took thoses images, heres the link http://www.ikedollardoubledie.com/1974-p-d-s-ddo-ddr.php
IF the coin were struck on a silver medal planchet of nearly the same size as the IKE Dollar, the weight would be heavier than 22.9 gms.
Case in point the shield nickel weight 5 grams comp. .750 copper .250 nickel Dia. 20.5 mm vs Liberty nickel 5 grams comp.750 copper .250 nickel however dia. Was 21.2 mm. That difference of .7 mm thickness made the Shield nickel harder to strike using the same comp. Of copper and nickel. .7 mm thickness does not seem a lot but it was as dies only got 10,000-12,000 strikes before they exploded .
Could of been but if it was it must of had a heavy plate. As silver plate wears off fast in thin layers. So high points from wear would show signs of lost plating.
FYI the one vote for the silver platchet was yours truly " I've seldom been wrong ,but never been right........ ask Jerry Garcia