Bought my 270 Classic in 1978.
IIRC Classics didn't start until '81. And I don't think .270Win was ever an option. BDL maybe?
The ‘Regular Production’ 700 Classics debuted in 1978 in 7 calibers: .22-250, .243, 6mm, 270, .280, 7mm Mag, &.30-06.
I bought my .270 Classic in 1980.