The 23D is first listed in catalog No. 66 (cover printed on brown paper) with a price list dated Jan25, 1932, (I have another No. 66 with a cover printed on green paper that is dated Jan 15, 1931 and it does not list the 23D). It mentions a new style stock and forearm just for the 23D so I don�t think these ever had a schnabel forearm. This catalog still lists the 23-A, catalog No. 67 lists the 23-AA; the 23-AA, 23-B, 23-C all still show a schnabel forearm (Catalog No. 68 no longer shows a schnabel forearm on the 23-B or 23-C). Catalog No. 67 is also the first to have the Model 19 (1933) and lists it as being available in 22 Hornet (also first catalog to show a half length stock); catalog No. 69 is the first to call it the 19-H. I would add more but I am already getting myself confused!!!!
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Gene