Head

Start in '60 w/the XK?
I understood the break came in '72 (from XY / to XA) ie model 2.4 to 3.1 kinda idea.
The XY being the last made for the preceeding 2 yrs (starting in '70) and therefore being V E R Y expensive.
The x-flow came in '76 (XC) model 3.3 (till '79).
Alu head '79 XD with a model of 4.1
now we're up to the 7th generation?
 
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