Mike;
Thanks for putting up the pics. Note on Battles pivot lever F that the sear adjusters are slotted externally. Also you can see the frame cross pin just where the contouring of the bar starts which serves as the bbl check. On the single hook guns the cocking pin in bbl lug bottoming in the hook slot serves as the check so this pin was eliminated. I have another G which is in the 28k range & is a large hook gun. This gun also has the externally slotted sear adjusters, but due to the change in sears they are located further forward in the plate, but still near the bottom. The small screw centered behind the ball on the G is the firing pin retainer, while on the F the screw there is larger & further back. On these models this is the sear pivot with the sear itself retaining the firing pin. At some point in time the sear adjusters were dropped on all grades below the E. Don't know the date for this but must have been generally betwen 28K & 38K or from about 1898 to 1901.
Battle; Is your pivot opener a rod cocker or the two-hook cocker? That SN is sort of in the transition range I believe.
