According to some on the CMP forum, that ^ 1911 is a RR slide, an Ithaca lower, and the “OB-79” EP means it was rebuilt by the USMC in Barstow.
Seems well worth the $$ for a USMC rebuild. Neat.
The OP on CMP said he took it out and it fired great. The OP also said that he didn’t get any notice from CMP, just the call from his FFL to come pick up his pistol, haha!!
Still hoping I get the call, haha!!