Rotary GT Monza ref. 611831 / 41730 (Caliber as 1902) Brand overview For several decades, Rotary has been offering affordable Swiss watches that combine design, reliable mechanics, and understated refinement. This "gt Monza" embodies a vintage spirit that blends sportiness and elegance. History of the model The "gt Monza" model (also spelled "Monza gt") appeared at Rotary in the 1970s. Of particular note is a 39 mm automatic version mentioned in databases as the "Rotary Monza" with a 39 mm case. Reference 611831 in particular is cited in an auction as "Rotary gt Monza ... marked to case 'Monza Switzerland 611831'." This model charms with its sporty case, sometimes with a rotating bezel and simple dial, in keeping with the "grand sport" spirit of the watches of the time. Watch description • Brand: Rotary • Model: GT Monza • Reference: 611831 • Estimated year: ~1975 • Diameter: ~39 mm • Case: Stainless steel (sporty shape, typical 1970s case) • Movement: Caliber AS 1902 Remarks A true vintage model that will appeal to those looking for a 1970s watch with a reasonable size (~39 mm) and a beautiful presence. Mentioning the exact condition of the case, dial, water resistance (if known), and strap will help build buyer confidence. The fact that it is a less common piece among mainstream brands can also be a refreshing asset. Delivery & Security Secure and insured shipping. Secure payment via Chrono24. Authenticity guaranteed. ⸻ English Listing – Rotary gt Monza Ref. 611831 / 41730 (Caliber as 1902) Brand history For decades, Rotary has provided Swiss watches that combine design, reliable mechanics, and subtle refinement. The "gt Monza" model represents a vintage spirit blending sportiness and elegance. Model background The “gt Monza” (also “Monza gt”) appeared in the Rotary lineup in the 1970s. Some references note a 39 mm automatic version. A specific lot mentions “Monza Switzerland 611831” on the case. It stands out with its sporty case shape, sometimes a rotating bezel, and dial styles typical of the era. Watch details • Brand: Rotary • Model: gt Monza • Reference: 611831 (and/or 41730) • Estimated year: Circa 1975 • Case diameter: Approximately 39 mm • Case material: Stainless steel • Dial: (to be specified by you) • Movement: Caliber as 1902 • Condition: Good overall condition; • Box / Papers: Not included Remarks A compelling vintage piece from the 1970s with universal size and sport-chic appeal. For collectors or daily wearers seeking something off-beat yet mechanical and Swiss. Please detail the state of the case, dial, bracelet, and movement for best listing impact. Shipping & Security Secure insured shipping included. Buyer protection through Chrono24. Authenticity guaranteed.