Well the model B was never sold commercially, they were all intended for the Navy to be used on-board ships, but often unused ones found their way out :) so they can often be in good nick. The overarm bracing does look cool but doesn't really do much for the headstock stiffness.

Gears are 14DP 14.5° so can be found quite easily. Did you get a full set of change wheels inc the 63tooth to do metric screw cutting?

What's the centres distance? It looks quite long.