Some early lamps are of a taller, slightly narrower design than latter types, typified by this "Clarrington Lamp". An interesting point is that the Rowe and Clarington lamps share identical metal work, construction and lenses. The only difference being that the Rowe has the external lens collars which pre-date the type fitted to the Clarrington. It would seem that sharing sheet metal sub-contractors was common practice by lamp manufacturers as identical components parts can be found on rival products. Alternatively a supplier might of had lamps manufactured to their specification by a sub-contractor who would then "brand" them with a trade name.