
McVitie Weston valve collection, STC valve, type 3H/160

STC valve, type 3H/160, marked 3, (RMW/Y716 - McVitie Weston number), by Standard Telephones and Cables Limited.
STC valve, type 3H/160, marked 3, (RMW/Y716 - McVitie Weston number), by Standard Telephones and Cables Limited.