You may have been thinking of the Dean, Bobbee. The Dean and the Bruce have the same case and take the same crystal. The only difference is the Bruce has an engraved bezel. In later years, the Dean had a stainless back, but ealier versions were all gold, per the adverts.
As for the Arnold, the very similar model you have to watch out for is the Norman, but that's another story for another post.
As for stainless backs, keep in mind that they aren't seen before 1940, so models dated prior to that--even if the same model as one seen later with a stainless back--will have a gold back. You can see that in the ads for the Dean, which starts out all gold, then changes to stainless. I also believe that's the story with the late 1930 Lone Eagles that we see, as they have an all gold case, whereas the later version has a stainless back, per the 1940/41 ad for the LE A.