All Leica M6, M4-P, M4-2, M5, & later M4's except the painted ones have, as
you mentioned, zinc top/bottom plates. M1, 2, 3, earlier M4's, and the new
painted M6's have brass top/bottom plates. The "black chrome" and zinc
plates were introduced around 1971 with the onset of the M5.
Skip
At 12:58 AM 9/8/00 +0000, you wrote:
"Brassing" doesn't mean much anymore. When the chromey finish is rubbed
off a Canon AE-1 you get a peek at milky plastic resin beneath. If I'm not
mistaken there's cast zinc beneath the finish on a Leica. (Nothing wrong
with cast zinc, BTW - it's tough stuff.)
Lex
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