Hi Karen,
1st & most important question. How do you know that it is from 1946 ? From the literature that I have, I think the earliest Seamaster came onto the market in 1948.
2nd, To guess at a value we'd need to now exactly which model we are talking about. If we ignore the date ( or say 1948 - 1955 ), there are loads of possible Seamasters that fit your description.
3rd, Gold Coloured band ? it will make a big difference to know if the band is Solid Gold or gold plated.
4th, Original box & papers will also increase the value dramatically.
5th, Inside the watch are various numbers ( on the movement & on the inside of the case back ). these will help us to give you more details.
Finally, even if I knew exactly which model we are talking about here I wouldn't know how much it's worth.
I assume it's not a divers watch ( from the age & that it is gold ). The 1st generation of divers can fetch very high prices ( I'd say $2000 upwards ).
I don't think that the "dress" watches are fetching those prices, but there ARE exceptions.
Sorry to put a negative side on your request. but without more Info, it's almost impossible to give you more details.
Steve