India Barred B Postmark And Tramway Cancel

I recently purchased these two from an APS sales circuit.

I've identified them as Scott 26 (type I) and Scott 43, respectively.

From this thread (https://goscf.com/t/65798) I learned that the barred B postmarks represent the Mumbai postal circle.

However, I'm intrigued by the violet tramway cancel on the right stamp. The black postmark seems to have been applied on top of the purple cancel. So, I surmise that the letter was deposited at a tramway station where it received the purple cancel, then later received the barred B postmark at the main post office. Am I close, or out in left field? Any insights will be greatly appreciated.

Thanks, Robert

The oval is not a postal cancel. Stamps were often counterstamped with a company handstamp, written upon with a company name or even lined or crossed in ink to prevent theft of the stamps. You will see this done at this time period not only in India but Ceylon, Malaya, Hong Kong, etc.

I had some doubt about the "postalness" of the tramway cancel. Thanks for the information.