It seems that once they entered the wristwatch era, around WWI, West End ceased to make their own movements. In fact it's not entirely clear that they did even before this but it is hard to identify aged pocket watch movements with any confidence.
It seems that WE have used only a few ebauche suppliers since WWI, perhaps as few as two. Watches from then to about the late 1930s mainly seem to use Revue movements, or at least movements strongly resembling on Revue ones. However these are signed only by WE and documentation about Revue movements is sparse so this is hard to confirm. Many of the late pocket watches also appear to use these movements.
Around WWII they seemed to have switched to using FHF movements. FHF movements seem to be standard until about the 1970s, after which ETA ones are used. I think around this time FHF merged with ETA which would explain the change.
Perhaps this change of internals coincides with the change in serial numbers? certainly it's around the late 1930s that they seemed to stop putting sequential numbers on the cases, though there are plenty of examples of watches with the double 4 digit number before this and many in fact with both. It's certainly not clear cut.
Additionally in the 1940s Longines movements appear to have been used for a time. I understand this was something to do with a ban on foreign imports into India so may actually have been at Longines behest in order to be able to continue sales there?
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