WEll, It is not a CLW loco in my opinion. CLW reworked and made a kit for the PRR H10 consolidation which is chunkier looking and most important has a Belpaire fire box. I have two of them. The details also are not like the CLW loco. Another one I would rule out is the Hine/Pearce 2-8-0. That model is based on their USRA 0-8-0 but again I think has a fatter boiler and a more husky look.
The underside with the open axle gear probably dates this to the 1940s-50s at best. However the level and quality of the detail that appears in the photos compares well with newer models. I don't think it is a Brass Import. I think it might be scratch built either by one of the custom builders of that era, or an individual for personal use.
I am not familiar with most RR steamers except Pennsylvania RR (PRR) to some extent. so I have no idea what the prototype might be. It appears to be a nice model and with some "tender loving care" (TLC) could be a nice piece. Straightening out the bends and dents on the cab roof and other details and a new paint job would do wonders.
Unless you find a prototype, any generic tender would work I think. You might find an old All Nation or General models tender that would do nicely.
