Those two 1960 E's in your photo are for sure not the standard versions. May be one or two more of that variation will turn up in that serial range.
My statement is based on my collected data of 17, 1960 style 99E's:
2ea - as pictured in the 1960 catalog with non-checkered EG style forearm, plastic butt plate, no grip cap and no filled grip cap screw hole. Both have LBC's of "K" (1959) indicating to me that the intent was to use the EG style wood. (Serials in the 967xxx range)
2ea - that you now own. EG style forearm, metal butt plate, no grip cap but filled screw hole (grip area cut as show in the catalog) and sling swivels. I don't remember if they have the same low end rear sight as the others (?). (Serials in the 9686xx to 9688xx range)
13ea - as cataloged but with a non-checkered "F" style forearm. All have the LBC of "L". (Serial range 9683xx to 9694xx)
So, back to my statement. Are your two 1960 E's the standard? I would say "no".
I'm hoping that one or two more will show up so we can see where yours fit in.
Are your's 1960 E's...not an EG or R or F so must be an E, just not in the standard configuration. (remember the 99-H, V1-3, small group of non-brl bands assembled 5 yrs late)
