All sorts of fun markings and cancels on this one.
Commercial cover mailed from Chemical Service Corporation in NYC to Vaccum Oil Co. in Rochester, NY. It appears to have been forwarded on January 19, 1940 (see inquiry division cancel on reverse) to the company's new address in Olean, NY, where it was received on January 23, and the 3 postage due stamps affixed.
Is there any significance to the use of the parcel post cancel? Or was it normal to just grab whatever canceling device was handy for use as a receiving stamp and canceling the postage due stamps?