I think it's brass not cast. As a brass model it can be made by a number of manufactures. Any one have a old brown book. My old book lists three ten wheelers. One made by KTM for the HO train Co.is the rarest. The next listed as a B-18 made for GHC. The last a B-18ca made by Samhongsa in Japan for Sunset. It is listed under remarks as # 2024. This must be the one. A factory painted B&O B-18ca numbered 2024 made in Japan in 1980. That is all the info I have.
frank toptrain
I don't think that it would be Samhongsa, as they're a Korean manufacturer.
Wayne