Actually, the standard/field grade as well as the Skeet Gun and the Deluxe was made until 1963. The reason they hadn't made the Skeet Gun without a rib, (in correcting KY Jon) was that after the war, the vented rib became popular and people started wanting them or the solid rib (which was standard from the beginning). This is why Winchester called on Simmons in 1954 to help them with the ribs. The Skeet Gun Trap Grade and the Trap Grade were discontinued in 1939. The vented ribbed 42s that were put out by Winchester went through the same routine as the Model 12s. The vented ribbed was added at Simmons and returned to Winchester in the white with no Simmons name on the rib. This was to keep the 42 as well as the 12 "pure" New Haven guns. Simmons probably put all of the 42 ribs on the guns, but not all of them had the name SIMMONS on them. Or at least they will tell you so. Ned Schwing will tell you that Winchester put their vented ribs on the 42s BEFORE they contacted Simmons. This is why most people who want a "true" 42 or 12 will avoid all of the controversy and just get one without the SIMMONS name on the side and why the pure New Haven guns are more desireable than the ones with the Simmons name, even though they are basically the same.
