58 isn't one of the G-Claron numbers. It could be anything. Something from some other plasmat, but not correct for that lens. Send it back where it came from if at all possible. If it's 57mm it's possible it is a rear group from a 270 G-Claron according to Schneider's chart.
Ummm... Mr. Fromm, I've got crow roasting according to a mexican recipe I have. Ready for you soon sir.
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