I just bought a vintage Kamaka as well. The gold labels were from '54 to '69 and the white labels began after that and went to I think the late 90s. I was recently on a site that had great info on the pineapples from Kamaka and from Ka-Lai (later Ka-Lae). I'll look for it and post it if I find it.
Thanks! Interesting too when I see pictures of the white labels, some have that feature to the end of the fretboard and some don't. Not sure what it's called but it's that sort of scooped design.