https://www.ebay.com/itm/115980586902
One distinctive feature of this chassis is a shallow area under the steam chest:
https://www.dropbox.com/scl/fi/say02e56fjvubxbqn5erz/Chassis-16.JPG?rlkey=k5ptntm8ycja34rf0298fh0yr
I am pretty sure I have seen other chassis with this feature, but I couldn't connect it with any manufacturer. In a complete coincidence, I put a recently acquired model on my workbench just yesterday that has the same feature:
https://www.dropbox.com/scl/fi/xr68gtwz2wqindgb1wcgf/Chassis-01.jpg?rlkey=0skob6j249bvyxtz4ph1255dk
https://www.dropbox.com/scl/fi/tazbiac50k1yd7gq7yb03/Chassis-03.jpg?rlkey=i3zvu012y64rxggn8snc253qh
To go one further, the chassis on this model actually looks like a match to the one on eBay:
https://www.dropbox.com/scl/fi/3ezk6t3zg0xsch0jlbmyn/Chassis-15.JPG?rlkey=55gfe7b1n95ih7cqshlpupzxr
This makes me think that the model must be pretty common, but I can't place it. Here is a side shot:
https://www.dropbox.com/scl/fi/zl1u424q9zzemp8g4v53y/SKU-4-6-2-NP-2260_01.jpg?rlkey=dlsq3qxbgtx4m7hvx14aroz64
The tender is a Japanese import (Max Gray?) but the model looks like a doorstop-era US-build. The pilot truck looks like an Alexander but I can't make any other connection there. Anybody recognize either the manufacturer of the model and/or the chassis?
Jim