Hi, I recently bought a Ross Zeiss Anastigmat f8 433mm (17") lens with a detenting lever that works an iris via a slot from f8 to f64 (not waterhouse stops). My problem is that it has an engraved serial number of 2xxx (which would place its origin in the 1840s) but I'm pretty sure it should be a 5 digit serial number 2xxxx which would locate it in the late 1870s. Haven't been able to find much info on this lens (rarity, value, usefulness) so am asking if anyone can help me out. Tony
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