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Working on the wagon this morning I spotted what looked to be markings on one of the wheel rims. A quick burst with the needle gun revealed
BAKER BESSEMER 25 1934
Baker and Bessemer Ltd were wagon wheel and axle makers of Kilnhurst, Rotherham. The works closed in 1963 making 1,000 workers redundant. Their massive drop hammer 'Tiny Tim' now forms a gateway arch to the Beamish Industrial Museum:
Presumably 1934 is the date that wheel was forged but it is not necessarily the date of the wagon as wheels would be changed from time to time. It will be interesting to see any wording cast into the other three wheels in due course.