Thank you all, Pan, David, Raid and Gabor!
Gabor, yes, I use a FOFER, that is a FODIS with a bigger wheel, so focusing is more precise. What always amazes me is the accuracy of the focusing system. However, it is slow.
The film I always use is Tmax400 developed in Perceptol.
I use a SBOOI viewfinder.
The prints are split-grade prints on AdoxMCC110 or Ilford MGFB.
I have three model A's, one from 1928, the others from 1930. I like the 1928 model with its mushroom release very much, but in use there is not much difference between the cameras. The condition of the lens is of course a very important factor when buying a Leica 1a.
Erik.