Re: Newly acquired Iver Johnson?
Thanks for posting photos. The patent markings do appear to be those I cited, party lost in the rounding of grip, but lack of the trigger safety used on earlier models identify it as a third model made 1909-on for smokeless powder, so maybe there was a carry over of marking.
It appears to be in exceptional original condition, with case hardening colors still present on the trigger, and should be kept that way as a collector's item, and not used as a shooter.
As Jim cautioned, if you remove the grips be careful. After removing the screw, I'd use a single edge razor blade to break the seal between grip and frame, and only the left one needs to be removed to view the serial number that might identify the specific year made.