Cam spec help

[Benny The Mule]

I have a crane cam i cannot reference the part number.
f-2 76406
251-6
BM5552

These are all stamped on the back of the cam. it is black like a core crane would use to final grind but Crane has stamped it, which they do not do until it is ground. if anyone knows specs please let me know.

Thanks.