This is the super scarce manual wind Valjoux 7740 version of the Calculator.
The calculator is a quirky watch to start with but this 740633 version beefs up the nerd factor by using a rare movement.
There's few of these surviving in original spefication as many have been cannibalised over the years for their precious movements (which also power the Black pvd Monaco).
Movements with Heuer bridges in place trade well over the €1500 mark.
My own opinion - value is somewhere around the €2750 level.
Great looking watch with heaps of "cool nerd" factor.
Cheers - Darren

: Dear Collectors
: Would like to know your comments and value on this manual
: Calculator?
: Thanks
: JB
: http://www.artomatique.net/