Pin 10¢ Revenue Stamp Here ?

Anyone ?

There was a whole series of documentary taxes on financial paper that usually showed up every time there was a war. This included 1914, and many that were re-instituted at that time did not end until the 30's, when the depression forced many changes in the tax codes. Some taxes, like the stock transfer tax which started at that time did not end until the 60's.
Since a copyright represented potential earnings, it would have been considered financial paper; apparently they had a flat tax of 10 cents for a copy of the certificate. As far as the government was concerned, "financial paper" was a phrase that was always stretched as far as they thought they could get away with for tax purposes.
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Thanks. So I'm assuming then that this card was something that was filled out locally then sent to Washington to be placed on the final or "Official" document ? And you're estimate would place it between 1950's - 1960's ?

The card would be filled out locally and sent to D.C., then the revenue stamp would be attached to the certificate of copyright directly and sent back to the sender of the card. This was very likely from the 20's or 30's.