ID: 1037676
Embassy Stamps
Business
1971 MACHIN 'POST OFFICE' PHOSPHOR REMOVAL 'IMPERF' TESTING TRIALS 1p & ½p ENDORSED 'ABET' (acetone, butanol, ethyl acetate, trichlorethylene, being the chemicals applied). Ex. Norman Potter archive with copy of his report & issued stamps. Our reference: E67772
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