I've now posted the 4 Series and 5 Series instruments, as well as updating my menu bar of links, so I've deleted my above posts about 'em.
What I'm planning on, because I have a bazillion picture links I'm coming across, is to finish up the text stuff and post a couple picture links when I do that. After the model list is complete, I'll then try to grab some more pics.
Let's see:
3 Series
5 Series
4 Series
2 Series
6 Series
500 Series
600 Series
7 Series (If I can find one. The first sterling silver horns. In other words, the "7" in your 9937.)
800 Series
880 Series
900 Series
901 Series
990 Series
991 Series
992 Series
993x Series
WO Series
... And, of course, there are the u (mu) variants that started (I think) in the 900 Series.
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EDIT: there's also an 80, 90, and 2100 model I came across today.