Geneve Dynamic Replacement Seconds Hand

Hi, I am lookig to source a replacement seconds hand for my watch and was wondering if anyone know where I might be able to get one from? I have also been told that the second hand I currently have is the incorrect colour, and that it should be blue, but I did read somewhere that this is not always the case.
Omerga UK have told me that the serial number of my watch is dated at 1979. The calibre of your watch is 1012, model number OX0000021, watch reference 1660175.
Kind regards,
Richard.

Many thanks for your help.

Do you have any pointers of where to start looking, I couldn't see anything on Otto Frei?