Double diagonal engine

A well made double diagonal marine engine, of freelance design but clearly influenced by Westbury's similar engine. Nicely finished, mounted on a wooden base - it goes well, self starting on air and running down to low speed. There's a clip of it running on air in the workshop here.

Flywheel 5 inch diameter
Bore 3/4 inch
Stroke 1 1/4 inch
Base 9 x 4 1/2 inches