The strip? King Solomon's Mines
The artist? Frank Bellamy
The comic? It was going to appear in the original Eagle magazine
Here's what the seller has to say
Episode # 3, from a total of three unpublished strips completed by artist Frank Bellamy. Intended for EAGLE magazine, as a replacement strip for FRASER OF AFRICA, but aborted when the Editorial team decided not to go with two consecutive African-based series - and replaced by MONTGOMERY OF ALEMEIN. Image size of approximately 20" x 12", artwork in excellent bright condition on heavy CS10 illustration board.