Too bad you don't have the serial number. According to The Parker Story, there were a total of 24 AH's made with Acme steel barrels of all lengths and 10 made with Damascus steel barrels of all lengths however there may be a few more due to missing order and stock books. Unfortunately our order books can only be searched by serial number, not name. I did check the archived research letters for the name Petherbridge but didn't find any letters with that name on it.
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