I have been trying to buy a 921 and 945 for some time the prices in Shuggart don't seem close to what these are going for.

I see lots of 921 movements; I assumed this was result of gold scrapping. But then I noticed many YGF 921 cases (often with dials also) for sale also?? I read somewhere that many 921's and 945's were/are purchased for conversion to wristwatches (that would be quite large??). Is this true?