Ideally 1 1/8 ahead with no longer than 120mm stem width and ideally 580 or longer bar length. Could use a quill stem if suitable enough. Not arsed about condition as it'd be stripped and painted or poliish d anyways.
don't know what's that (was reapinted as pictured when I bought it with a bike), but it's quite lightweight and 1 1/8"
cn check lenght if You're interested