Tudor Lolipop BLack submariner

They will be up for auction locally as one lot, but the auction house advertises these to be from the 1920's. The Illinois is an automatic and whist I am not familiar with their watches I do not believe they made any auto's in the 20's. I would like to add some American watch brands to my little collection and the possibility to get 3 in one go is appealing, so realistically what would you guys be prepared to pay in an auction room not eBay ?........

My mother gave me this LeCoultre womens watch she said belonged to my Great-Grandmother. What I am trying to find out is, how old it is and what it's worth. I do know that my mother had it serviced in the mid 90's and that it works now. It has a hand wound mechanical movement and what looks to be the original box. I am fairly certain that the bracelet is not original. It says "USA" and 10k g.f. on the back. The watch back says 10k gold filled as well. I have no other papers except the servic........