Cheers for this mate, I’ll edit the postIf it's a 91 are you sure you don't want 1" 1/8 stem. Pretty sure from 1990 onwards the Pine Mountain was 1" 1/8 until ahead came along.
Needs to be a quill stem not aheadFound this, if it helps
Original, retro, Marin handlebar stem. 1 1/8 11cm | eBay
Find many great new & used options and get the best deals for Original, retro, Marin handlebar stem. 1 1/8 11cm at the best online prices at eBay! Free delivery for many products.www.ebay.co.uk
My apologiesNeeds to be a quill stem not ahead