Originally Posted by Erik van Straten
Your III is nice, black paint with paint-filled engravings.
Personally I do not like the synch conversions. Conversions without the synch do exist, however.
I have conversions of II and III with and without sync and have never had problems with either. However I think my favourite is a prewar conversion of an early black I to IIIa. It is very, very quiet. (They were all serviced at some point by Peter at CRR, the IIIa was junk when I got it but its provenance justified to me at least the expense of sending it to Peter.)