Thanks for the offer of parts help, Herman and DA Aquamaster. I wish I'd read your posts a couple of days ago since I did end up ordering from Vintage Double Hose. I had ordered a mouthpiece from them some time back, not realizing it was 1 1/2". The owner kindly offered a refund, but having seen some of the other more pricey websites, I just ordered the hoses from VDH that are 1" on one end and 1 1/2" on the other to fit the mouthpiece. This is probably heresy to the true lovers of old equipment, but I think restoring it to original working condition would cost more than the reg is worth. The diaphragm and HP o-ring have hardened, the duckbill and mushroom valves are missing, etc. I figure most of our patients won't know the difference, and the one who donated the reg body will be happy to see it displayed.
For Duckbill: thanks, I did run across that web page in my search for parts.
Thanks again everyone for your kind assistance!