It does look like that, someone else suggested that too. I think the parts are too old and the trunnion pivots, cylinder covers, bearings and bolts are different. The most obvious difference however is the crank having only 2 bearings with the free end connected to a single crankweb on the 2nd piston
Here is a video of the Miranda launch and the engine can be seen at 1:05
Thank you for your interest in the trying to find out the make and model
