re: British South Africa Fifty Pound Revenue Stamp
Hi Lee
Depends if it is perf 12½ or perf 15.In my 1985 Barefoots it's listed under Rhodesia& Nyasaland £ 50-00 as perf 12½ and £35-00 as perf 15, 1897 .Prices quoted are for fine used copies. Sorry can't help with the perfin.
Hope this helps Brian