Companies that printed dials for UG

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So i've been wondering, how many official companies printed dials for Universal Geneve. I've seen a few dials with no markings on the back, which i believe are made by UG? On others, you got SINGER, which made dials for a bunch of watch companies. I believe i've also seen A.L. stamped on the back of some UG dials.

Are there any information on whom printed dials for UG?
 
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Is there anyone that has nabbed any leftover dials from Universal’s US operations? (Id like to get a 1948 Sugar Bowl dial)
 
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Does a marking on a dial back indicate a (blankl) dial maker or a dial printer?
 
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I believe Stern made dials for UG before. Read it from an auction lot history piece