HR, Hopkins Allen, F&W and IJ all had that same look....cheap suicide specials...most were DA only....one can buy one today for 150 bucks NIB pre-1899 on Antiqueguns.com....no JBT paperwork either.
I think what you have is a Model 1900 Iver Johnson .22 Revolver built for a reseller like Sears and Roebuck or Montgomery Wards who may have specified the "Scout Model" designation. The lack of cylinder fluting is consistent with that model; the checkering on the grips is Iver Johnson's signature design for that period. Iver Johnson made minor changes in their guns almost yearly while the overall design remained basically the same.
The high serial number indicates a maker who has been around for a long time who made a lot of guns. Iver Johnson was founded in 1874 IIRC.
The three digit number is the "drawer number" used in the gun assembly shop to assure that all the matching parts for a specific gun are kept together during the manufacturing process.
Your gun is probably the 6" model... be sure to measure the barrel to the cylinder, not the frame.
HR, Hopkins Allen, F&W and IJ all had that same look....cheap suicide specials...most were DA only....one can buy one today for 150 bucks NIB pre-1899 on Antiqueguns.com....no JBT paperwork either.