据说有的徕卡II改装成徕卡III，号码还是II的序列。
但徕卡I和徕卡II很不一样。是首个内置取景器的徕卡相机，改装起来很难吧。。。

看到一台徕卡II相机，破旧不堪，网上查了徕卡机型和编号如何对应的文章，相机的编号竟然应该是分配给1931年徕卡 I A的，67XXX。好生奇怪。1932年起是徕卡I和II交接的时间。
有懂徕卡的老师解惑吗？或者网上传的编号其实有很多特例？ 本帖最后由 vitas 于 2020-6-3 10:12 编辑

回答正确~

Leica offered factory upgrades for earlier cameras until at least the middle 1950's.  Many cameras were sent back to the factory to be converted to the latest model.  The converted camera would keep the original camera's serial number.   This explains why your camera may have left the factory as a black A, II or III, but is now a black or chrome Leica II, III, IIIa, IIIc, or IIIf.  Conversions may have been done to IIId or IIIg, but I personally have never seen one.  The most interesting conversions for me are converted black IIIa, IIIc, and IIIf -- models that were not usually produced in black.

查到了。原来徕卡一直到50年代还提供返厂升级活动。这机器购买时是1931年的leica I A, 后来升级成 leica II。顶部编号没变。