Commerative Medalions From The Osborne Coinage Company

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I recently came into a partial collection of commemorative medallions issued by the Osborne Coinage Company. They come in a couple foil stamped albums Noted Great Moments in American History. Apparently they were issued as part of a set that came out every month.

Each month a nice printed card described and event. For example Issue #41 for November 15, 1976 was for Cambridge Massachusetts and recognizes the establishment of Harvard College, established November 15, 1637. There's also a stamped window envelope that was mailed to the recipient and postmarked Nov 15, 1976. In the window of the envelope is a 1 troy oz. Sterling silver medallion that commemorates the event.

I have all the months from #41 in Nov, 1976 through #73 dated July, 1979. I'm trying to find some reference that might help me establish the value of the partial collection.

So far all I can figure is the bullion value of the silver in the medallions.

Thanks for your insight.

Stu