Pete, recall all the brou ha ha with my "1914" receiver dated 1917 Erfurt. I learned from Jan Still and others that when the "later" Erfurt models were released, with the relieved breechblocks and stock lugs (1915 and later) the clip bottoms were single proofed. This is a trademark of a "later" Erfurt, especially 1917 and 1918.
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