A vintage solid brass optical instrument, featuring a secondary parallel sighting tube connected via dual brace rings and an end cap secured by a chain. Dating to the mid-20th century, this navigational or military-style accessory reflects classic optical engineering with an unpolished finish. It makes for an intriguing decorative collectible or a restoration project for maritime and optics enthusiasts. Fair vintage condition with visible surface tarnish, minor spots of oxidation, and light handling marks consistent with age and use. The lenses show some dust/age haze internally, but the brass structure remains solid and intact. Dimensions: 43 cm (L)