Troy,
I have seen CO's, DO's, and sauce pans by BS&R with the tab handle. I don't believe that I've ever seen a skillet lid with a tab handle though. From what I've learned the tab wasn't used very long, that night be one reason the items aren't often seen. One gentleman told me something along the lines; That after the "Matics" came, It didn't take us long to figure out how to make a tapered handle to swing out of the mold. In the 1987 BS&R Catalog, (It's in the PDF's), they still show a Dutch Oven, and a Sauce Pan with the Tab handle, but the Camp Oven shows a looped handle. I believe in the case of the DO, it's just an old picture being used, as I have newer DO's with looped handles. Now in the case of the sauce pan, they never changed the patterns, and continued using the tab, due to it being such a low volume item. Sort of like the discussions we've had on three-legged camp skillets having gatemarks, but were made through the 1930's.
I still keep in contact with a couple of these older gentlemen, and if anything new comes up, I'll post it. Part of the problem is many years have past. Remember also, to them, most of the changes that were made, and the daily operations of a foundry, were just ordinary, not anything really memorable. That is why when a questionable piece comes up, that I can't get confirmed, I would rather say no, than yes. I would hate for every unidentified piece of cast iron to be attributed to BS&R.
Scott; Sportsman's Warehouse still has the CO10 Deep. I was up in the Denver Area this past week and checked.
Mike; I have seen one Chinese CO, and numerous Chinese sauce pans, all with tabs.