The Longines Calatrava Ref. 7841-1 is a classic manual-winding dress watch from the late 1960s, highly regarded for its understated elegance and reliable in-house movement. This specific reference is often sought after by collectors for its "oversized" 35mm presence, which was larger than many standard dress watches of its era.

• Case: 35mm diameter (excluding crown) stainless steel case with a slim profile of approximately 9mm to 9.2mm. It typically features a polished finish, chamfered bezel, and a screw-down or snap-on case back.

• Movement: Powered by the Longines Calibre 284, a 17-jewel manual-winding mechanical movement. It operates at a frequency of 19,800 BPH and offers a power reserve of approximately 42 hours. This movement is considered one of the brand's best "in-house" hand-wound calibers.

• Dial: Features a silvered sunburst or satin-finished dial. It typically has raised baton hour markers, often with black central inserts to match the hands, and a central sweep seconds hand.

• Dimensions: Lug-to-lug length is roughly 39mm to 40mm, with an 18mm lug width for straps.