Strange Tales #181 (published by Marvel Comics in August 1975), but it is a highly distinct version: it is a 9p UK Price Variant

During the Bronze Age, Marvel printed a limited number of copies featuring pence pricing directly in the top left corner instead of the standard 25-cent price for distribution across the UK. This issue is a notable key book as it features the second appearance of Gamora (where her name is officially revealed) and the third appearance of Pip the Troll. £30