There is one angled brace South of the sound hole and the Spruce bridge plate / brace, that's it. I use Nylgut strings on this guitar and must say that it has incredible bass response from such a tiny, ladder braced guitar.
I am about to attempt this same repair on my Model 1915 Washburn. Can you give me some advice as to how to how to either remove or replace the bridge plate? I have the exact same problem that your pic shows.
Have already removed the neck for a reset!
Hope to hear from you soon.