If you've spent any time around brass, Oriental Limited tends to come up when you're looking through imported models for sale. A lot of their runs were built in Korea and are known for solid construction and clean detailing that still holds up well.
Most pieces you’ll find are HO scale locomotives and rolling stock from limited production runs, which is why availability can be hit or miss depending on what you're after. You can find more in brass model trains when building out a collection.
