Rory, we've talked about it in a different thread, but just to document it here ref your #4. I have a 99E SN 969806, .308 win, LBC M (1961) with 20" Chicopee Falls barrel.
Yep! Got that one. And I have a box for another like it.. tho can't remember if it has a date on the box.
“The Savage 99 Pocket Reference”. All models and variations of 1895’s, 1899’s and 99’s covered. Also dates, checkering, engraving.. Find at www.savagelevers.com