Fellows, the I grade was the bottom Lefever sideplate grade. I, H, G, F, etc.
There is an excellent book by Bob Elliot about Lefever which describes the various periods, the grades, history and construction details.
Unfortunately, there is no Lefever forum although there is a collecting organization. Several people here are Lefever collectors, Josh Lowensteiner being a significant collector. We have had posts here about them, you might check the thread Lefever Fever.
Replacement reproduction Lefever butt plates and correct pads are available from Connecticut Shotgun Mfg.
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