More info not coming in so far, but I figured I'd better note what conclusions I have before the thread falls off the map.
Both guns are commercially proofed with an upright c/N, DWM's practice after 1920. Neither gun has a GERMANY stamp, indicating that they were intended for internal--Garman--sale. Following the IMKK rulings pursuant to the Treaty of Versailles, it is likely that the guns were .30 cal., 3 3/4in barrels.
The import markings CAI ST ALB VT are the hallmark of Century Arms International of St. Albans Vermont. In the absence of other barrel markings, it is likely that Century Arms rebarrelled the guns to 9mm. As this is the only apparent connection between the two guns, it is most likely that the undeciphered frame markings were applied by Century Arms as well.
Dad's Luger is a reworked WWI DWM weapon. Particularly noteworthy is that the sear bar is unrelieved; these were changed to the relieved style in late 1916. This gun also has a stock lug, which began to appear in late 1913. This provides a possible range for the origin of this gun.
1913 Lugers were produced into the e suffix range; a b suffix 1913 is probably too early to have a stock lug (information from Still, "Imperial Lugers"). Costanzo documented the particular inspector stamps on this gun as appearing only in 1914 and 1915.
It is most likely, then, that Dad's Luger started life as a 1914 or 1915 Imperial Army DWM.
The upright c/N on the left receiver and breechblock of Mom's Luger, with no marks on the right receiver, suggests that it probably is an Alphabet Commercial. The number 5 stamped on the frame, receiver, and takedown lever are probably renumbers indicating the frame and upper are mismatched. Without photos of the front of the frame, and numbers from other parts of the gun, not much more can be said.
--Dwight
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