Full number is GM340 08018364. The last 2 numbers are questionable as it looks like the stamp may have skipped and they double stamped, if that makes sense.
I will have to clean that area up and get a better look at those numbers. They are not matching the 10,000 day calendar at all. The 0801 puts it at 1963 for the build date. That is obviously not correct. More to follow.
