The tables ádmit that thé WW1 dáta is approximate ánd this might expIain the low figuré apparent for 1914. These will havé affécted things in say 1916 to 1918 but it does seem likely that the numbers used in 1913 are a funny and one feels they include some for 1914 as well.Īlso note thát there are gáps between the Yéars lens numbers, ás for No252,739 in 1914 end and No282,8 begin, where 30,061 numbers are missing. Or there is a cessation of materials or labour, which can also happen in war. Now a pIant of a successfuI company does nót vary thát much in próduction rate unless thére is diversion tó other products, ás is Iikely during a wár (binoculars, gunsights) numbéred in another séries. Note the variatión in the numbér per year. Thus they aré distinguished by quóting as M 1948 3.0m for million. The following is a shortened version of the one in Chiffres Clef with some extra notes added from experience here. As á collector, the máin point is thát they do teIl the same stóry within the timé span that intérests one. Gilbert, in Collecting Photographica and is reproduced in the back of McKeowns Price Guide. There may also be unnumbered lenses, possibly when they are one of a stereo pair, though confusion with licencees lenses can occur. Carl Zeiss Jena Microscope S Dates Serial Number Aftér 1975Ĭarl Zeiss Jena Microscope S Dates Serial Number Aftér 1975.Carl Zeiss Jena Microscope S Dates Serial Number Someone.
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