Description
1971 MACHIN ‘POST OFFICE’ PHOSHOR ‘IMPERF’ TESTING TRIALS 2½p & 6p & endorsed ‘AB’ (Acetone, Butanol – being the chemicals applied to it). (Ex. ‘Norman Potter’ archive & with photostats of this report).
1971 MACHIN ‘POST OFFICE’ PHOSHOR ‘IMPERF’ TESTING…
Ref Nº : E63288Lot Nº : 724
£ 575
1971 MACHIN ‘POST OFFICE’ PHOSHOR ‘IMPERF’ TESTING TRIALS 2½p & 6p & endorsed ‘AB’ (Acetone, Butanol – being the chemicals applied to it). (Ex. ‘Norman Potter’ archive & with photostats of this report).
