Permite connecting rods

by Butch
(Kannapolis, NC)

I have a very old air compressor, probably 70 years or so, it still gets used almost every day! I just rebuilt it to fix a rod knock. No way to ever find parts. Information on the unit is:

Porto Spray
Model A2 S/N 107
Manufactured by:
Mechanical Repair Co.
909 Villa Ave.
Indianapolis, Indiana

I have it working good again but would love to know how old it really is?