This kind of documentation would be found in the Order Book. As with guns being sent back to Meriden for the addition of selective automatic ejectors such important alterations as Single Selective Triggers would most likely also have been documented in the appropriate Order Book. However, several Order Books are missing today.
It was customary after 1910 that when an earlier hammerless gun was sent back to Meriden for most any kind of work, the latest version of the replaceable wear plate be installed at no cost to the customer and rarely, if ever, documented.
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