[PT57]

Here is part of the Ebay listing which addresses the electronics questions:

"This is a 1940 Philco Table Radio, Model 40-130. It is a six tube (all Loctals) a.c. superhet receiver tuning the AM Band, 550 to 1500 Khz and a Short Wave Band, 1.5 to 3.3 MHz. The radio also has a built-in loop antenna mounted on the rear back board. I was able to hear plenty of AM stations but only a few signals on the SW Band. Back in 1940 this SW band was more active. There is a low level hum, but not present when a station is tuned in. The volume is loud with no distortion.
The filter capacitors and a few resistors were replaced, a nos 7C6 audio tube was replaced, a new line cord installed, two new dial lamps installed, repairs to the loop antenna and connecting leads, a new clear dial cover and finally the receiver was aligned."

Then it goes on to explain the cabinet restoration process.

I'm wondering if something did happen to it in transit. Also... there's what appears to be a small adjustment screw peeking through the back cover. What could that possibly be for?