莱卡III
The Leica III is a rangefinder camera introduced by Leica in 1933, and produced in parallel with the Leica II series. Several models were produced over the years, with significant improvements.
The Leica III uses a coupled rangefinder distinct from the viewfinder. The viewfinder is set for a 50mm lens; use of shorter or longer lenses requires installing an alternate viewfinder on the accessory socket.
Leica III型相机,亦称巴纳克相机(Barnack Camera),由Ernst Leitz GmbH Wetzlar公司在1933年推出,全机械式,具备先进的连动测距(Rangefinder)功能。继承Leica II型相机的优良血统,採用螺牙接环(Screw Mount,L39),并新增慢速快门转盘,在当时,将竞争对手Zeiss Ikon AG公司旗下的Contax I型相机远远甩在后头,当年的机身售价,相当於一栋市郊的透天厝。
(这里介绍资料来源:
http://reader.roodo.com/citta/archives/11583125.html)
推测福本手上的相机为莱卡3c或3b,下图有时间轴确认
莱卡3b与3c的最早生产时间分别为1938、1940年
莱卡3c的快门稍稍重新调整过,这也可以作为参考之一