This is a Vacheron Constantin jumbo model from the 60s. At the time, It was called jumbo because of its large size.
This is an in-house k1014 movement. It has good tolerance with manual winding and lasts over 24 hours with full winding.
It is a two-hand watch without a second hand and has a Sigma dial, Making it one of the rarer models. The Sigma dial is a rare model that still uses white gold indexes on the dial.
It is 35mm in size excluding the crown and 36mm including the crown. 36mm is traditionally the most common size for Rolex. It is very thin at 6.2mm.
There are models without the Maltese logo, But the logo is still important. In addition, Out of the 1, 000 or so produced at the time, Only a few were steel, So their rarity is even higher.
The strap is genuine with Vacheron's logo written on it, And the buckle is also genuine with the logo engraved on it.

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Submariner Date Ref. 116613LB