Deacon, great item.
You probably know all this already, but since you asked for leads...
The Internet Pinball Database is the premier source for pinball info.
Your specific game (
Baffle Ball Sr.) is here:
http://www.ipdb.org/machine.cgi?id=131
and more variations of
Baffle Ball can be found here:
http://www.ipdb.org/search.pl?any=ba...archtype=quick
Pinside is a pretty busy pinball forum with plenty of discussion of antique games. That's here:
https://pinside.com/pinball/forum
Two excellent books on pinball and coin-op history, both of them loaded to the gills with big color photos, are:
Pinball! by Roger C Sharpe (1977, E P Dutton)
and
Slot Machines and Coin-Op Games by Bill Kurtz (1991, Chartwell Books).
Baffle Ball is mentioned and/or shown in both.
Sorry we can't provide any input on market value. The tabletop versions of
Baffle Ball are seen fairly often,
but the
Baffle Ball Sr. coin-op is pretty scarce, and we haven't tracked any auction prices for it.
We hope that's of some help.