Vintage Ohlsson & Rice Model Airplane Engine Serial # 129711 Very Cool Look 👀

Greetings vintage model airplane lovers and collectors ! For your consideration is an Ohlsson & Rice model airplane engine with propeller and Modelectric ignition coil. The only markings are the O & R logo and the

serial number 129711 . I’m not familiar with these engines,so I don’t know if it’s a model 23,29,60 or ? Hopefully someone that does will see this and it will be a nice addition to their collection. It’s not seized and I don’t see any scoring on the piston walls. But I didn’t use a magnifying glass so I’m not positive on the scoring. Please,look closely at the attached images as they are a part of the description and help provide a good idea as to the condition of this item. Please,feel free to ask any questions you have and I will do my best to answer in a timely manner.