Another submission from Peter Valicek. This time it's a nice-looking sideport diesel which clearly dates from the early post-WW2 era or perhaps even from the war years themselves. I have no dimensional data, so I don't know the displacement - all I can say for certain is that it's engine number 544! I have an odd feeling that I've seen this one before, but I simply can't put a name to it. To me, it looks like an Italian or perhaps Scandinavian unit. Hopefully some kind reader will recognise it and put me out of my misery!

IDENTIFICATION MADE!!  Reader Amadeus Kurz wrote in to tell us that this engine is a 2.44 cc diesel called the Mirus Senior II produced by the Italian maker Emilio Biraghi around 1944. Biraghi was a young sportsman from the Milan area. He had been involved in modeling and other sports since the late 1930s. Given his relative proximity to Switzerland, he was able to buy a few foreign engines there which inspired him to pursue his career as an industrialist. The turning point was a sports victory, the prize money from which was spent to buy a Dyno diesel. That engine inspired the production of a series of model diesel engines by Biraghi. My sincere thanks to Amadeus for sharing this information with the rest of us!