This is the model in the SP range that replaced the Minor 1. The engine and boiler are similar to the MM1 but with a blue painted frame. The main differences being a different base, base mounted chimney (standard on most of the SP range),
It is an overtype engine with everything mounted on top of the 1 1/2" diam x 3 1/2" boiler, including the 5/16" diam x 1/2" stroke cylinder, 1/4" safety valve and 1 1/2" diam spoked mazac flywheel. There is a water level overflow plug in one end of the boiler. The boiler end cap is too small for the sight glass fitted on most of the SP series. It has a solid fuel tablet burner.
The paintwork appears to be original and is in reasonably good condition.