Ive seen a few online. A 6 ounce once on heritage sold for almost 400 bucks and a 21.48 ounce one on great collections has a starting bid of 2500. Yes 2500. A lot of 5 oz ones on heritage also went for about 800. They seem to command quite a premium over spot
If you looked at old auctions with dates you may be able to guess an approximate date if theres distinct looks to the different years, but other than that without using chemicals or something to date it I dont really think youd be able to pick out a specific year unless theres a data base for the years of the serial numbers, but even without that I could see narrowing it down to a time frame just not a specific year
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