Jim,
I am not an authority on vintage specs but I can tell you this
much.........my daughter's '72 27' A/S has similar skin to the newer ones.
The transition from the old style aluminum must have been made before '72 at
least. I wonder if the change was made coincident with the new body shape
for the '69 model year?
Someone on the list knows and will provide an
answer.
Harvey
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