This is the smaller, low output Best & Lloyd pump introduced in 1926 and intended for lightweight bikes. On smaller engines the normal Best & Lloyd delivered too much oil and caused overoiling issues, sticky valves,etc. Not many makers used it as most either changed over to the Pilgrim pump or redesigned their engines with dry sump lubrication.
There are very few bikes left on the road that run this pump so although it is hard to find, very few people want them. Its just as much a buyers market as a sellers market.
Best of luck with it.
