Dating Zeiss Sonnar 50/1,5 - help

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fantastic cat

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Apr 18, 2009
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Hi!
Yesterday one man asked me about my sonnar - is it pre-war? - and then i realized i know almost anything about it's history.
Serial number is 2858457. There are blue coatings and red T mark on front ring.
I've checked google for information about zeiss serial numbers and found some indicating it may be wartime version, but i'm far from being sure.
There's also one, strange thing about it: my sonnar has few (or maybe even more than 10) very small air bubbles in its glass, wchich is, i belive, rather unusual for '40 zeiss products. But maybe im wrong?
 
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