The Panerai Radiomir 3 Days Acciaio PAM00687 is a limited-edition timepiece released as part of a special series (typically dated around 2017–2018) that tributes the brand's historic 1930s models. It is highly distinguished by its "tropical" brown dial and a unique 12-sided engraved bezel. 

• Case Size & Material: Large 47mm cushion-shaped case made of AISI 316L polished steel.

• Dial: A mesmerizing shaded brown "tropical" dial with luminous Arabic numerals and a sandwich structure for high legibility.

• Bezel: Distinctive 12-sided bezel engraved with "Officine Panerai Brevettato," reflecting vintage patent designs.

• Movement: In-house P.3000 calibre, a hand-wound mechanical movement with a 3-day (72-hour) power reserve.

• Water Resistance: Rated at 3 bar (~30 meters), emphasizing its status as a vintage-inspired dress/collector piece rather than a modern diver.

• Limited Edition: Restricted to a production run of only 1,000 pieces worldwide.