Cathy & Dave β It is Greener, Rd No 182002 of October 30, 1891, and the example shown on John Bell's website (thanks for the link, Dave) under Greener Design ID-1 looks identical to mine, apart from the colour, which is a more vaseline greeny yellow, and glows like crazy under my UV lamp.
I shouldn't try to describe glass from memory! The base star is 12-point, not at all Davidsonesque. The pattern between the square villa platforms looks more like the modern British way of installing underground services β gas, electricity, water and sewage authorities each doing their own thing with no coordination.
It measures just under 3" with a rim diameter of 2ΒΌ". It is an imitation cut pattern in a general sense, but as it has internal corners could not have been made by cutting a blank. A three-sided mould with a pattern repeat of nine. The registration number across the inside base is very faint indeed.