Breitling navitimer valuation?

Ok so my brother in law asked me to get a valuation on his limited edition navitimer and I don't have the foggiest idea on value. It's a 2002 Breitling navitimer moonphase in 18k white gold and it's number 9 out of a limited edition of 25. It comes with everything and is recently serviced and just had a new strap fitted. Are they sought after due to its low production number or did Breitling practice special editions a lot? I don't want to join another forum just to ask it's worth I would rather ask on here for advice. Here's a few photos for your enjoyment and any advice is greatly appreciated. Thanks guys.

I know you said you don't want to join another forum, but...are you on the breitling source forums? The guys there will give you a pretty honest appraisal. This is a pretty breitling - specific question...and besides...if you do sell, that's a great place to market it.

Another way is to call some dealers, like Govberg or toppers, and ask them what they would give you as trade in equity...add about 25% and you have an asking price for a private sale.

Good luck and let us know the consensus. A Navitimer is on my short list, although I think a solid gold LE would be a bit dear 😀