dbl. walking beam Stirling (hot air) Engine

I was at a local antique fair last week and this jumped out to me like a shinning beacon. Although I do have other walking beam hot air engines, I didn't have a double walking beam. I didn't think that anything such as this would show up at an antique get-together. I had to purchase it.
I took it home, and because it didn't have a burner, I fired it up with an alcohol burner that I had. It ran well for a few minutes and then petered out. Stirling engines will do this if the heat is too great, It probably will run just fine on candle power.
It has no mfg. name on it, just two letters cast into the base casting. A heavy little engine with all the castings made from cast iron. The rest is all brass. It stands approx. 12" tall and is 10" long. I think it is of European origin because the faulty set screw in the flywheel was metric.