Dating Biogon & Sonnar Lenses

J

jamesmck

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Jul 7, 2006
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Would appreciate hints on how I might determine manufacturing dates for the following lenses:

Zeiss-Opton Sonnar, 1.5/50mm, #104xx55
Zeiss-Opton Biogon, 2.8/35mm, #113xx43

Thanks in advance.

James
 
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