Anybody know who this is-was?

[bonestock72]

Has anybody noticed this signature on their Suburban or Panel? I have a 67 Panel , 68 Suburban, 71 Suburban (none currently for sale). All of them have the Z code from the Fremont plant and all of them are signed on the cowl, one on the passenger side and the other on the drivers. Looks to me like “r” on the passenger’s side and “j” on the drivers. I have a 65 custom cab z code and it is not signed in this way. Just curious, Ken.