Iver Johnson 32 2nd Model

[Otterlifter]

I have just purchased an Iver Johnson Top Break Revolver.
Small Frame 32,Manufacture info on top barrel rib,patent info on bottom grip strap.
Serial number prefixed with K487xx,I need to find the production date for it.Owl is facing the barrel.I know it is a 2nd Model due to only having 2 pins on the frame and having two lock lugs. Thanks in advance for any and all help.