Cannot Find "B" on speed selector

[FabioTerrosi52]

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Hello everyone

I have purchased a Leica IIIa but I cannot find the "B" option on the speed selector I have: Z, 20-1, 30, 40, 50, 100, 200, 500, 1000.
Is there another way to do that funcion?

Thank you for yr help
Fabio Terrosi (Pisa-Italy)

[UliWer]

Put the selector for short shutter speeds on „Z“ and the selector for long speeds (at the camera’s fron) on „T“ - so your shutter will be open as long as you press the release button. 

P.S. I was wrong! Speed selector on „Z“ and selector for long speeds at the front on „20“ will open your shutter as long as you keep the button pressed.

If you put it on „Z“ and „T“ it stays open when you let the button loose, but will close when you turn the speed selector on the front towards the „1“.

Edited March 12 by UliWer