Question on Anniston Date Codes

[USGI]

My understanding is that the ANAD date code for the pistol shown on the left is October 1980. What's the date for the other one? Do these stamps indicate reworks, or just inspections? Thanks! - Bob

[old tanker]

Pistols that were refurbished at Government arsenals will usually be marked on the frame/receiver with the arsenals initials. These refurbishes could be minor inspections to major overhauls. The one on the right looks to have been through rebuild at Springfield Arsenal previously. The ANAD stamp on it doesn't look complete?