Having been a docent at the San Diego Firehouse Museum for ten years, I have a pretty good sense as to what's typical of the period. I think your steamer is great . . . although the harness arrangement looks a bit odd, fire rigs of the time used special harnesses that would drop down over the horse and could be fastened quickly. Even if the model is a figment of the makers imagination, there are not too many people around these days who can say the setups wrong from their personal experience. So enjoy a wonderful find . . .
Bosun Al