Blue watches are offered by a wide variety of brands. Based on search results, you can find blue models from, for example: Patek Philippe: According to Chrono24, prices for blue models such as the Aquanaut, Ellipse d'Or, Gondolo, Twenty 4, and Calatrava start at approximately €6,657 to €21,190 (entry-level models) and reach up to approximately €160,989 for models like the Nautilus.
Breitling: According to Wempe, models such as the Navitimer Automatic 41 are available for €5,950.
TAG Heuer: According to Wempe, blue watches, including the Carrera Chronograph and Aquaracer Professional 300, range in price from €4,350 to €7,950.
Longines: According to Wempe, models such as the Conquest and Hydroconquest GMT can be found in the price range of €2,150 to €3,250.
Baume & Mercier: Blue watches like the Riviera Baumatic 42mm cost €4,750 according to Wempe. Chronenwerk also offers watches from Baume & Mercier (e.g., Classima, Riviera Baumatic, Clifton Baumatic) in price ranges from approximately €3,450 to €7,790.
Frédérique Constant: Chronenwerk carries watches from Frédérique Constant, including a Flyback Chronograph Manufacture listed at €3,790.
Other brands at Chronenwerk: Chronenwerk also carries brands such as A-Nis, Armani Exchange, Bell & Ross, Bering, Beverly Hills Polo Club, Citizen, Oris, and Philip Watch, which may also offer blue models. A specific price range for blue watches from these brands is not immediately apparent, but the overall price range of the available watches extends up to €8,040.