Old pics in original post, showed original seats, vinyl,  yet Diseazd stated recovered seats as his later post pics shows.

Interesting mix of parts.  Appears to have Series 1 engine cooling fan (metal), and Series 1 Brake and Clutch M/C's, but the rest of the gear looks like later-issue (e.g. air cleaner with 'summer/winter' control flap, 'Nissan OHC' valve cover, balance tube with top vacuum port).  Not sure whether those are 3-screw or 4-screw SU's.  The rear hatch glass has the vertical, Series defroster grid but the hatch itself lacks the Series 1 extractor vents.  Seats are the early design (adjuster knobs).

It's a 6/71 manufacture date. It's a transition Z. No vents, no 240Z pillar emblem, angular driveshafts, "A" tranny (probably), late valve cover, metal fan, etc. My 71 is a transition Z.

When I purchased my 1st Z, new in June 72, it had vertical defroster lines

http://www.classiczcars.com/topic/42742-what-is-it-series-i-or-series-ii/

This might help......