I have looked my 12 gauge 21 over closely once again, but find no markings from Griebel. That said everything points to being done by Griebel.
After 64 years the coin finish and engraving are still as nice as the day the gun was received by the owner in 1947.
Can anyone give me the name of a good appraiser? I have been contemplating selling. I shot 2 limits of dove with this gun and then parked it in the safe. The only gun I own that I will not shoot again as it is just so nice.