The Omega De Ville Tank XL (Ref. 155.006) is a very rare, oversized vintage timepiece from the early 1970s, notable for its architectural "Tank" or "Deauville" compressor-style case and automatic movement.

• Model/Reference: Omega De Ville Tank XL / Ref. 155.006 (or 155.0006).

• Case Dimensions: Approximately 27mm wide by 45mm–50mm lug-to-lug.

• Movement: Omega Calibre 684, a high-grade automatic mechanical movement with 24 jewels and a semi-quickset date.

• Dial: The grey Roman dial variant is considered "very rare" compared to more common blue or silver versions. It often features a vertically brushed metallic texture.

• Crystal: Unique faceted Omega plexiglass crystal that creates a gem-like appearance and sits proud of the bezel.

• Rarity: This specific "XL" tank is highly sought after by collectors for its dramatic 1970s geometry and "Jumbo" wrist presence.