Alan- I'm not an expert but the lack of an airhole would indicate a pre 1920/30 ball, I believe. Can't help with better dating or the manufacturer. Unless you want to replace with a new air-bladder, I would recommend filling with Poly-Fil foam. Polyfil works great, gives a solid shape and feel for display, and is very easy to use - just stuff the ball. You can also replace the laces with leather laces, and then finish off with some Mink oil for a great patina.
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