McVitie Weston valve collection, BTH valve, type A.T.26
BTH valve, type A.T.26, serial No. 575, (RMW/J89 - McVitie Weston number), by British Thomson-Houston Company Limited.
BTH valve, type A.T.26, serial No. 575, (RMW/J89 - McVitie Weston number), by British Thomson-Houston Company Limited.