Wall Rack Made With Spools; Tramp Art?

This was one of my late mother's favorite pieces. As far as I can tell, the rack has it's original gold-painted finish. There is one small spool missing at the center top, but other than that, the wood part of the rack is in good condition. The fabric panel has some worn areas, and it appears as if the material may have already been well-used when the rack was made.

Can anybody tell me approximately when this might have been made? I am guessing the 1930's, but could it be earlier?

I would love to know what this rack is worth. Were these ever made commercially, or are things like this always one-of-a-kind?

Also, is there a specific term for this craft? Is it called Spool Art? Tramp Art? Folk Art?