This is the 20 ga VHE "Big D" referenced earlier. It has a fair amount in common with the infamous "Widgeon Club Guns." It's a #1 frame, 20 ga VHE, with 32" barrels choked F(.38) and F (.41), chambers are 2-7/8", straight stock and is DOES have a safety.
Mr. Conrad sent a note along with the letter indicating it was the first time he had seen the same gun sold twice. As you can see from the letter it was originally sold in April 1917 chambered for 2-1/2" and 2-3/4" shells to Cline and Cline in LA and again in October of 1917 with 2-7/8" chambers to a gentleman in San Francisco. Given the configuration and the location it was surely used for ducks along that flyway. Weight is 6-lb, 12-oz.
Note on the photo of the barrel flats "22" is stamped on the left flat. A repair code, perhaps when the chambers were lengthened?