I have a almost complete set of .999 pure silver coins(tested with a silver testing machine) with toning on each. Almost each coin has either 0tt stamped on the front. I can't seem to find anyone that knows what they are or where they came from, as I'm missing ten out of fifty. (I would like to finish the set) I was told the album book is from the 1950's.(from one coin appraiser) The Oregon historical society has not responded to my calls or emails. I'm hoping someone can shed light on these. I want to finish my dads collection and his search of these coins for the last 15 to 20 years. Thanks
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