Forget the old marks . The only relevent ones are the 12-70 850 bars and the bore size .719 & .729.What confuses me is that there seems to be a discrepency in so much you have a mixture of metric and imperial.After 1984 bore size was either in millimeters or imperial equivolent .720 .728. pressure in Kg per sq Cm. .Bars came in in 1990 [actualy they started late 1989] and bores would be marked in metric.
Its got me puzzeld and without seeing it any thing else wuold be guessing. Realy need to see the proof date or get some background from the seller. Hate to say it and I do hope that this is not the case here but I have heard rumours of fake proof stamps in the U S .
