Engine block identification help

[COUPE9]

I recently acquired another e9 (2800cs), and scored an additional M30 engine in the transaction as well... ...can someone please help me understand the stamp on this additional engine?... ...on the area above the flywheel / starter is stamped: +2150010+ . Typically, if I'm not mistaken, this stamp (on our e9's) aligned with the VIN of the e9... ...however, this number does not align with the VIN research done by e9-driven: https://e9-driven.com/E9_Vins.asp

Help please.

 

[HB Chris]

It’s a January 1969 2500 automatic motor which the first build month for USA spec E3s. Same bore at 86mm as the 2.8L but shorter stroke.

 

[sfdon]

Wow !
Nice work Mr. Chris!

 

[COUPE9]

Thanks Chris!! Now, if only I could find e3 VIN#2150010 to drop this motor into!!