Late 1960's Heuer Carrea Reference Identification

Hello Fellow Forum Members,

Attached are photos of a late 1960's Heuer Carrera Chronograph. The watch was purchased from the original owner from a Socal Speed Shop in the late 60's. A receipt was included but no reference number. Instruction manual and catalog was included no box no papers. I bought the watch in 96. Restored by Baume Swiss in SF around 98. New acrylic and perforated strap. Gave this to a friend in 99. He still has it. Looking for the reference number. Thank you in advance.

...and a very nice one too. Cool to have the box...while its clearly a vintage box, I would have thought that these were more early-mid 1970s boxes, whereas the watch is late 1960s.

cool watch