It is not an out of battery safety, it is the camming surface that cocks the firing pin as the toggle opens in recoil. As the breech block returns to battery, the cocked firing pin is caught by the sear and is no longer in contact with the forward toggle link finger. The angle of this finger is different between the Old Model toggle and the New Model with the improved breech block/extractor.
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If it's made after 1918...it's a reproduction
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