Bolt labeled "A" "SA" and 620

Here's the pics for you all to look at from jdmcomp...

per request, used basic loader to get pics online, regular loader would not accept them for some reason, apology for the quality, showing unmolested as found rifle.

In addition to the port milled into the receiver, 4 parts were modified/changed for the use of the Pedersen device. You can see from these pics that 3 of them are present and I would think that the trigger is also original. I have not removed the stock yet to see.Attachment 80289Attachment 80290
As you can see the sear has the center part indicating the two part sear, and the bolt release has the cut for attaching the device as well as the spring loaded slotted pin. This is turning out to be quite a find.

Your bolt was made at Springfield Armory in 1944. The bolt was made as a spare replacement for use in overhaul. The marking atop the handle is actually a poorly-stamped "8620".

J.B.