As I say below, the serial database sees some black painted markers with 3,6,9 in the late 143xxx range but not 142, they are all steel ridged markers 142xxx. I can only tell you what the serials show.

R

Thanks for your answers
: However one thing I do not understand: I have one 1163 MH mark 3
: (polished steel markers, with luminous inserts, polished steel
: hands with luminous and black inserts, 3-6-9-12 on hour
: recorder) with serial number starting by 143! So basically mine
: is the equivalent to the Siffert mark 4 but with a black and
: white dial. Why mine starts with 143 when the equivalent Siffert
: model start with 144 and not before?
: Antoine