4" 4 screw ,non model marked H.P. 51 years old.
6" 4 screw non model marked H.P.
Adding in here to this original post, A pretty neat project I finally had the opportunity to undertake.
I bought a scratched and rusty 28-2 at a local shop for $217.
I cut and crowned the barrel ,round butted it ,and made it into a fixed sight gun,
Here are the pictures.,,,I call it a model 528.
Regards ,,,Al