The natural finishes during the earlier Oaklawn period were not as common as the wraps but that changed towards the end of the 1960s. The vast majority of Camco kits I've had were lacquered finishes - I've got one mid-period and one late Oaklawn both like that.
I'd guess the whole late Summer Of Love "back to the garden" vibe from 67 on had its influence in this more "natural" look from Camco (as well as the other manufacturers) - that and the cover of Cosmo's Factory.
Lacquered Oaklawn (and probably Chanute) era drums had clear lacquered insides. Wrapped shells had white painted insides. LA period drums all had clear insides, the lacquer being so thin as to be almost non-existent.
Bearing edges on the LAs significantly different (i.e. sharper) from the earlier badges.
I'm not sure I'd agree on the 100 kits worldwide (unless I misread and we're talking only Geo. Way)....I've got three Camco kits, have had another three and I've never lived in the US.
It looks like there was no export until the LA era though.
There doesn't seem to have been any methodical numbering of drums, except for the occasional pencil written letter on some LA drums, and much of the information floating around about Camco is anecdotal from people who worked at the factories or older dealers...downside of this is one piece of inaccurate information can be spread as gospel.
The "budget" line had centre-mounted Tuxedo lugs...these were of a more conventional bullet-shape for anyone phobic about the perfect symmetry of a circle.