Absolutely a DC Bantam 0.75 cc-in production from late 1959 until 1970. The reason it appears similar to the Dart diesel is that it uses the same crankcase casting as the Dart-machined slightly differently, and has the same stroke (the top end however is quite different, to allow for the increased displacement of 0.75 cc versus the 0.55 cc of the Dart.) Reasonably common still on Ebay, they were quite gutless-but started and ran well.....which is what I suppose is important in a beginners' engine. The DC Wasp-which replaced the Bantam in 1971-was a much better engine. Run it on about a 15% nitro fuel-and as pointed out it should have a short reach plug. The only point to be careful with is the head gasket-which is a very narrow and thin fibre one-and easily damaged. Don't unscrew the cylinder fins from the cylinder liner if you can help it. When new, they came with an integral tank attached to the backplate-this was cylindrical (not rounded like the Dart one), from spun aluminium, and had filler, vent and feed nipples riveted on. It was of adequate capacity for a FF model, but of little use for any other type of usage so often removed.
What to use it in? seeing as the original poster is German, he might like to put it in Graupner 'Topsy'-which would be a very good match for it, size wise.
.....a couple of afterthoughts-it runs best on 6x3 down to 5-1/4x3 props-and there is (or rather was) a radial tank mount accessory for it which also interchanges with the Dart-this screws into the crankcase in the place of the normal backplate, and has the same mounting bolt layout as a tanked Cox reed valve engine.

ChrisM
'ffkiwi'