NO; The forearm for a gun of that era is different than that being used when the DS was introduced. This should be a "Two hook" cocker & has the extractor cam in the forearm as well as some other differences. I believe all the DS grades would have been built on the large cocking hook style, as well as all H grades. You will be limited to a forearm from a gun built on this style action. Will likely have SN from the late 1x,xxx to early 2x,xxx range, but is no firm cutoffs at either end. Many features on Lefevers had some overlap in SN's
PS; This gun very likely also had the push button release in center of forearm, most later versions in the lower grads particularly had snap off forearms, & even some very high grade ones did also.
