Armourlight 10 inch lemon colour glass suspension. The "PB" on the cap is probably Pilkington Brothers Ltd, the company that had the Armourlight trade mark. Pilkington merged with sediver '71. There are markings etched ? into the top side of the glass; 'Armourlight' in an arc, followed by 'CBS 15 53, 12 67''- Similar to the marks shown on this 7 inch disc. [id=270377417] .