Smith Corona Bolt Question

[GColloton]

Hi all! This is my first post. I inquired about this on Gunboards, but I’m trying to expand my results.

I just purchased a very nice 8/43 Smith Corona in the mistake 4870000 serial range (correct serials for that date range were 4780000 I believe).

Everything looks correct SC with very little use, with a rearsenal at Ogden ordnance depot (OG).

My question is in regards to the bolt. As I understand it, a “correct” Smith Corona bolt will be unmarked or marked with an “X”.
USGI replacement bolts during WWII were “CC” and “B&S”. So what bolt do I have? I can’t make out the markings.

There’s also some type of marking(?) on the end of the cocking knob. Looks like a faint pentagon.

I’m just curious what I’ve got:

-The illegible marking appears to be inside a square on the outside of the bolt arm (possibly an “85”’but that would be a strong maybe),

-it’s unmarked on the top where the “X”, “CC”, or “B&S” usually is,

-it’s also unmarked on the front side of the bolt arm.

-There is a punch mark or character on the underside of the bolt arm.

*The other curious thing is the faint Pentagon shape on the back of the cocking knob. It’s visible in photos previously posted, but not very visible just looking at the gun in person.

So hopefully someone has seen something similar.

Thanks again.

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