This has arrived. It bears serial number 385 lightly inscribed on the flank of its port side mounting lug, not visible in the photograph due to camera limitations.

It has poor to fair-ish compression but pleasingly no shaft play. Overall it is in fairly good shape. The correct prop nut is missing and the thread will need a die run over it. A couple of other minor issues will need sorting.

Advice from those knowledgable about these engines would be welcomed.