This appears to be a 1971 Banker "GH". The case is yellow gold plate with a stainless caseback and N1 date code. The movement is a 17J 6CL also with an N1 date code. The dial is unique in that it has hour markers at 12 and 6. The dial appears gray but the 1971 Linebook shows a GL variant with a taupe dial and describes it as having 12 and 6 markers. Taupe is listed by definition online as a Gray Brown color. Looking online I see some gray taupe colors so I am thinking Taupe might just be their name for this color dial. There are only 5 Banker Gx variants....GG, GH, GJ, GL and GK. GG, GH and GJ are different watches so I am assuming this has to be the GH as it matches on all points.
Case Serial No.
Round domed Plastic