Crowned Koi
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Crowned Koi
The Collection

Explore Our Watches

Curated vintage & collectible timepieces

By appointment in NYC

Every watch authenticated in-house by Pat. Reply to any email or text to reach him directly.

pat@crownedkoi.comMon–Sat · 10a–7p ET

Crowned Koi

Certificate of Authentication

CK-CERT-6C6B5191

Brand

Rolex

Model

GMT-Master II

Reference

16710

Serial

Z6•••••

Authenticated by

Pat at Crowned Koi

Date Issued

September 26, 2025

Scan to verify CK-CERT-6C6B5191

Verify at crownedkoi.com/authentication/6c6b5191f5bf4353a21b5d90f5e46631

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