Bestfit 2-piece stem / winding arbor #340/31 for MST caliber 352, 371 Waterproof Watches

ONE Bestfit 2-piece MALE stem for MST caliber 352, 371 and perhaps 420 movements, from the Bestfit Assortment #340 of waterproof stems, No. 31, new in envelope. These came in a couple of different lengths and this one is a SHORT model. See images for further details. Fitting stems without the original is as much of an art as it is a science, especially with waterproof stems, as setting the correct stem length is critical to the crown achieving a good waterproof seal. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. If you need a part for an American watch I likely have it. Images do a pretty good job of representing the item.