Any Doll Collectors Here To Help???

I'm preparing for a yard sale next week, and I'm trying to find the value of a doll I want to sell to make sure I'm not selling a valuable doll for pennies. Can anybody help?

The box says "Seymour Mann", "Connoisseur Collection". I opened the box, and there's a registration slip in there that says "504438". I would assume this isn't like a limited addition number, I wouldn't think that a doll with over 500k in numbers is limited, but if it is I can't see an item that high up in the numbers being very valuable.

Is anybody very knowledgeable about dolls, or about the Seymour Mann dolls?

I would just go to Google or EBay and check there

Lol that's what's driving me crazy... I've been all over the internet!!! Digging through even the most obscure auction sites, using every search term I could think up! I hope somebody here might be into dolls!