Again, more questions than answers about the two different McKennas. These two bottles appear to be in service roughly the same time period. I believe the C&I possibly started just a bit later (late '70's) than the Western base. ??
Why the different molds?
Size reduction? The C&I bottle is an ounce or two smaller. Don't think that is it.. The non C&I is a transitional bottle, glob and toolie, used well into the '80s. Well past the start of the C&I's.