The A12 was all chrome until 1973 after which both black and chrome versions were available, numbered 30074 and 30147 respectively.
Included (might not be in photographs): This back does not have a matching insert.
Cosmetic: Moderate wear, including some loss of the black coating to the edges. Which is very common.
Mechanical: Fully working.
Light seals: The light seal is light tight.
Graded: Excellent Plus
(Signs of light use, but not misuse. )