I understand your feelings, but I think you're attaching a bit too much romance (and emphasis) to the "in house" movement.
Up until the 1940s, many Swiss makers, at all but the lowest price levels produced many "in-house" movements, some good, and some not so good.
The ebauche industry had started much earlier, but by the late 1920s had seen great consolidation and was producing not just raw movement parts, but complete movements, leaving only finishing and adjustment to the "maker". The economies of scale offered by their large scale production, the pressure forced by the combined market disruption and increased demand of the Second World War, and the competitive advantage afforded to the movement makers by Swiss national policies made it difficult for smaller firms to compete, so a great many of what we consider mid-level firms (and more than a few of the "high grade" ones) began offering watches with movements based upon these outsourced movements. After many, many mergers, acquisitions and take-overs ETA (which had formerly been
Ebauches SA emerges as the dominant manufacturer, but they too are eventually incorporated into the vast watchmaking holding company Swatch Group.
Cyma was not immune to these pressures, and was taken over in 1966 by Chronos Holdings. Even before that, they had begun using outsourced movements. A quick glance through my Bestfit guide shows Tavannes (Cyma) movements produced by Aurore, Peseux, Fontainmelon, ETA and A.Schild.
You may want to refer to
this article by Claude Girardin to gain a bit more understanding of the inter-relation of Swiss watch firms.
The romance of in-house movements, at least to serious collectors, is generally associated with those things that make the in-house movement different from the ebauche movements. Design, detail, finish and function are all different, and this can help to reinforce the "snob-appeal". To the majority of wristwatch collectors that I know, it is a small component of the overall appeal of the watch. Wristwatch collectors tend to go for the total package. The design, the case, the lugs, the dial, the movement, and in some cases even the strap, combine to make a watch that for whatever reason is attractive and thus collectible. I have friends who collect uncased pocketwatch movements, just for their mechanical attributes. I don't know anyone who collects uncased wristwatch movements other than for spare parts.
And while an "in-house" movement can make your watch more "exclusive", it can also help to make your vintage watch harder to maintain and service, as parts are more difficult to obtain and specialized procedures are less likely to be known. Try to find someone with a stock of vintage Pierce or Movado parts, and you'll see what I mean.
My two cents,
Cary