Sorry that reference is in German!
"1935 – Model X Bantam The UK’s under-224 lb reduced road tax category was replaced in 1932 by a new under-150cc tax classification. Douglas introduced....,... the Bantam was offered with flywheel magneto – the Model X, for £24, or as the Model X1 with full dynamo lighting for an additional £3. This Bantam is from 1935, the last year of production"
https://douglasmcc.co.uk/gallery-1930s/