1978 (01) Energy - Mercury - PETROPHIL Overprint - BP Forties Field, Aberdeen H/S

Unusual Mercury cover with the PETROPHIL Overprint...

Petrophil 'Logo' far right and 'Petroleum Philatelic Society International' Text vertical on the left side....

BP Forties Field, Aberdeen H/S.

Numbered No '6' on the rear flap......... Rare cover...

Code: 66138