I think I still have some of those old plastic Gudebrod fly tying bobbins & slim spools of thread around here. I had forgotten about them until now that you've mentioned them!
The 1oz spools are about twice the width of standard spools, and that bobbin is made for the larger spools popular with rod builders.
I broke a Griffin standard bobbin one time trying to pry the arms open enough to fit the 1 oz spools. The arm broke right at that little brass band, where they solder the whole thing together. That's when I went to the rod wrapping bobbins.