Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 1

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 2

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 3

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 4

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 5

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 6

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 7

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 8

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 9

Thumbnail Zenith Prime chronograph (handwound El Primero), gold-plated model 20-0010.420 10

Model:	Zenith El Primero	Last Scraped:	June 21, 2024, 8:18 p.m.
Username:	NE_Colour_U_Like	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

This is the handwound version of the El Primero chronograph that Zenith sold in the late 90's. This particular variety has 20-micron gold plating and no numerals (except the 12), providing a clean and classy style. Includes original Zenith branded buckle and gator strap.

Tech Specs:
38mm case diameter (not including crown or pushers)
45.7mm lug-to-lug length
11mm overall thickness (including crystal)
cal 420 movement
hi-beat 36,000 vph (seconds hands tick at 10 Hz)
reference 20.0010.420

More info about this and other handwound El Primero models can be found in this thread:
https://www.watchuseek.com/threads/zenith-el-primero-hw-zenith-prime-cal-420.434241/

This watch is in need of service. All functions work, however it will randomly stop keeping time when it should still have plenty of power reserve remaining. This behavior began unexpectedly after almost two years of ownership, without any obvious cause such as a drop or bump event. Rather than have it serviced myself, I decided to pass it along to the next owner and free up some space in my watch box.

I have a number of transactions as buyer and seller on WUS and r/Watchexchange. See my profile "About" page for details: https://www.watchuseek.com/members/ne_colour_u_like.1494944/#about

All photos and video were taken in the past week:

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Highest:	$12,680	Lowest:	$3
Median:	$5,850.00	Std. Dev:	±$2,536.41

Estimated Private Party Value $3,950 — $7,450


	Established:	1865
	Website:	http://www.zenith-watches.com/
	Country of Origin:	Switzerland

Zenith SA is a Swiss luxury watchmaker. The company was started in 1865 by Georges Favre-Jacot at the age of 22, in Le Locle in the canton of Neuchâtel. Zenith was purchased by LVMH in November 1999, becoming one of several brands in their watch and jewellery division. Jean-Claude Biver became Interim CEO in 2017, replaced CEO Aldo Magada, who replaced Jean-Frédéric Dufour in 2014.

Zenith has a long reputation for the quality and precision of their watches. It is one of the Swiss watch manufacturers that still produce their own movements in-house.

The El Primero calibre, which was first released in 1969, and still produced today, was one of the first automatic chronograph movements and has a frequency of 36,000 alternations per hour (5 Hz). This high rate allows a resolution of 1⁄10 of a second and a potential for greater positional accuracy over the more common standard frequency of 28,800 alternations per hour (4 Hz). The El Primero was honoured with a 2012 release of the El Primero Stratos Flyback Striking 10th, limited to 1,969 pieces (in honour of the original 1969 release date), that housed the same 36,000 vph movement and a sub-dial measuring in tenths of a second to make a complete rotation every ten seconds.

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