Great find indeed. And very interesting and informative to me.
If presumed “all original”, it shows an early 145.012-67, approx February 1968 production, with the newer chrono hand and crown.
145.012-67 are generally seen in two movement number ranges. 2607Xxxxx (April - August 1968 production) the largest group and 2500xxxx the earliest. Also a bit of 265xxxxx (October 1968 production, my latest example) just before the 145.012-68 kicked in (November 1968 for mine).
Well done!