McVitie Weston valve collection, Ediswan Barretter valve, type H.T.B.2.
Ediswan Barretter valve, type H.T.B.2., pinch marked m, (RMW/K3 - McVitie Weston number), by Royal Ediswan.
Ediswan Barretter valve, type H.T.B.2., pinch marked m, (RMW/K3 - McVitie Weston number), by Royal Ediswan.