The Burnac range was made for a short time after the war I am told that they were made from surplus shell casings. Judging by the weight of the engine that is believable as it weighs 850 grams as it stands.
This model is in an overall very good condition. It has unfortunately lost its chimney. This is a cosmetic item and it would be simple to make.
There is a crack in the sight glass but this would also be an easy repair. The release valve has lost its spring and the Burner is missing.