CH 1932 185-190+F16-F18 Disarmament Conference Geneva and airmail stamps Sets FDC with address (Registered letter)

Switzerland 1932  Disarmament Conference Geneva and airmal stamps,
Sets disarmament conference and airmail stamps FDC with address (registered express letter),
canceled with special cancellation GENEVE Conference du desarmement 2.II.32-11,
on the reverse arrival cancellation Basel Telegraph 2.II.32, Ernst Müller - Letter, in very good condition
Catalog: SBK 185-90 and F16-F18, Michel 250-55 and 256-258.