1971 MACHIN'POST OFFICE' PHOSPHOR ½p endorsed'AB' Acetone, Butanol being
1971 MACHIN'POST OFFICE' PHOSPHOR ½p endorsed'AB' (Acetone, Butanol - being the chemicals applied to it). Norman Potter' Archive (& with photostats of his report). This item is in the category "Stamps\Great Britain\Elizabeth II\Decimal (1971-Now)". The seller is "embassy-stamps" and is located in this country: GB. This item can be shipped worldwide.