I have seen 2447S Carrera's break through the $3,000 range they have been in for the past two years.
Certainly 2447 N/T/D command above the $3,500 range and then we see P/SN/NS pushing the $5,000 mark.
2448's still struggle and can be bought for $2,000, GP does not appeal to many buyers.
2456 models are few and far between, and I cannot put a market value on them.
If you add an original GF bracelet, I would expect to add $1,000 to above values. If you are selling probably be better
off selling it separately from the watch.
The above represent my tracking for the past four years.

Brook