Leitz offered from 1930 to their 
customers to upgrade their camera in different versions.
Here illustrated is a Leica IA upgraded to a Leica IIa syn.
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Here illustrated is a Leica IC upgraded to a Leica IIIa syn.
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Here illustrated is a Leica IIIc upgraded to a Leica IIIf
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Illustrated a Leitz Wetzlar leaflet, from 1956, front page, offering the different versions a customer can upgrade his/her camera
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Illustrated a Leitz Wetzlar leaflet, from 1956, inside pages offering the different versions a customer can upgrade his/her camera with the relative cost in Deutsch Marks.
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Illustrated a Leitz Wetzlar, from 1956, add, offering the different versions an Ic and If can be upgraded with the relative cost in Deutsch Marks.
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