Citizen Quartz Men's Day/Date Watch Gold/Champagne Sunburst Finish Fluted (ridged) Gold-tone Bezel Model/Reference 6100-072901

$250 (Purchase via eBay click here) (Facebook Listing)

Citizen Quartz Men's Day/Date Watch Gold/Champagne Sunburst Finish Fluted (ridged) Gold-tone Bezel Model/Reference 6100-072901

Buyers responsible for purchasing new battery and any maintenance the watch may require.
Purchased as-is, no refunds, refer to photos. Ask any questions before purchasing.
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per Grok: 

This is a vintage Citizen Quartz men's day/date watch from the 1980s–1990s (likely late '80s or early '90s), reference/model 6100-072901 (sometimes written as 6100-07290 or similar). 

Key Details from the Image and Markings

Dial: Gold/champagne sunburst finish with stick indices (baton markers), "CITIZEN QUARTZ" branding, and a day/date window at 3 o'clock (showing "SUN 4" in your photo). It has a fluted (ridged) gold-tone bezel.

Case/Band: Round stainless steel case (~35mm diameter, quite thin at around 8mm), two-tone (silver/gold) bracelet with a classic integrated link design and fold-over clasp. Lug width is typically 18mm.

Back Markings: "Citizen Watch Co. 6100-0729O1 M 01206529 GN-4W-S > 6" aligns perfectly with known examples of this reference. The "GN-4W-S" is a common Citizen case/bracelet code (not unique to this model; it appears on various vintage Citizens). The "M" likely indicates men's sizing, and the serial helps with production dating. 

Movement and Features

Caliber: Based on the 6100 series (often 6100A or similar thin analog quartz). These are reliable, accurate quartz movements with day/date complications (quick-set usually via the crown). They were part of Citizen's thin quartz lineup. 

Other specs (typical for this ref): Mineral crystal, snap-back case, basic water resistance (often not rated highly or "not water resistant" in listings—treat as splash-resistant only), central seconds hand. 

Context

This is a classic, affordable vintage "dressy" or everyday quartz watch—sometimes nicknamed styles like "the old man's watch" for its timeless, conservative look. It was a popular everyday wearer with a President-like aesthetic (fluted bezel, two-tone, day/date) but much more accessible than luxury equivalents. Many surviving examples have been serviced with new batteries and still run well.