rough estimate would be around $800 to $1,000 each, for either the Monte Carlo or the Sebring. Add $200 to $300 if they are on a genuine double back-plate.
as two "singles", these guys sell at a discount to the timers that are paired with the Master Time clocks.
I hope that this is helpful . . . photos would be useful to fine-tune the estimates . . . thanks for your message.
Jeff
+++++++++++++++++++++++++++++++++++++++++++++++++
: I have two dash-mounted Heuer watches. A Monte
: Carlo two button and a Sebring three button,
: early model. Both are in excellent
: condition, clear class and run perfectly.
: Where can I find a value on these?