From about 1905 to the twenties Waltham strove to market a thinner dress watch than their standard 12-size 1894-model, and they succeeded with several models, including their Colonial watches in various models. Another very successful way they did this was in their "Opera Watch" wherein they put a small 6/0 (Jewel Series) movement into a larger diameter case. A distinctive filigree spacer held the small movement in place. Waltham mostly used their "Ruby" grade, but also occasionally used a "Riverside", "Diamond" or "Diamond-Maximus" movement.
The earliest catalog I have showing this model is from 1917 and shows only a round-cased watch with the Ruby movement in 18K for $120, 14K for $96 or gold-filled for $62.50. By 1921 they were offering the Ruby movement in several different case styles in 14K -- round ($115), octagon ($145), cushion ($150) and square ($155) and well as round and octagon gold-filled ($95 & $110). Most of the gold examples are in cases by Dubois/Depollier but a few have been seen in custom cases by other manufacturers. In a 1923 catalog the opera watch appears to have been phased out, in favor or their thin Colonial-A models.
Here are examples of the octagon and square styles of Opera Watch, both cases by Depollier & Sons. I would love to see some other examples posted.
Robert, thanks for showing the round example. Do you have a picture of the whole watch from the front? Tom, I look forward to seeing yours!
Here is a picture of the nicest one I have ever seen. This is the cushion case in 18K white gold. The pictures are snagged from eBay and I do not know who currently owns this beauty.
Jerry, Dug out my opera watch today. Pic is below (dial). movement on next post. As you will note, is the same octagon style case as yours, but mine does not have the seconds register.
Here is an Opera watch in a round case that I recently got from Rob Jones. It also has a Ruby movement. It goes nicely with my octagon and square watches.
Thanks for starting this thread. This is great stuff. Of course, threads like these are all over the site and will start to be recognized. Thanks also enormously to all who contributed.