Alley & Maclellan Sentinel Waggon Works national war service badge

A scarce original Second World War issue National Service badge for this interesting engineering works based in Worcestershire and Glasgow, who made Road Steam Lorries, Railway Locomotives and Steam Railcars; the reverse impressed in relief with official issue number 'A&M Ltd No.449'. Very good condition, complete with original lapel fitting, no damage to the enamel. Diameter 26mm.