Long butt plate screw with drawing number

[JiminLE]

Anyone have any info on the long butt plate screw with a drawing number stamped on it?
I was changing stocks when I noticed it.

Thanks,
Jim

Information

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[RCS]

early production number screw started with B-8881 and B 8881, later are marked B-8881-6 and B 8881-6. these screws with the drawing number were used into the 19K serial range

[JiminLE]

The one I got is marked B 8881-6.
thanks,

Jim