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Re: Fully restored all-Swiss watch with 24-hour dial [message #6362 is a reply to message #6355]

Fri, 18 December 2015 19:43

Thojil
Messages: 650
Registered: May 2013
Location: Concorès, France

Gruen Master

JackW wrote on Mon, 14 December 2015 03:26

These watches were likely what was later just simply marked with the 'Pan American' stamp on the case back. Otherwise there is not a discernible difference between these plain backs and Pan Ams.

My experience is that there is a critical difference between the Gruen only and Pan American signed ones. I found this when trying to replace a bad case of a Pan America signed watch. These cases are usually strongly corroded and I bought a good non Pan American case as a replacement. Unfortunately my joy was short lived when it arrived and found there is a 3.5mm difference in the threat diameter of the case back.

Initially I thought that I was just unlucky, but over time I have measured 3 Gruen only signed case backs and 4 Gruen Pan American case backs and found the same results. Why this difference I dunno. Maybe Gruen wanted to avoid exactly what I tried to do... Embarrassed

So be careful, you can't swap the case backs!!

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[Message index]

		Fully restored all-Swiss watch with 24-hour dial By: JackW on Mon, 14 December 2015 02:26
		Re: Fully restored all-Swiss watch with 24-hour dial By: Gary on Mon, 14 December 2015 02:33
		Re: Fully restored all-Swiss watch with 24-hour dial By: JackW on Mon, 14 December 2015 03:03
		Re: Fully restored all-Swiss watch with 24-hour dial By: Thojil on Fri, 18 December 2015 19:43
		Re: Fully restored all-Swiss watch with 24-hour dial By: Timeticker on Sat, 19 December 2015 00:55
		Re: Fully restored all-Swiss watch with 24-hour dial By: JackW on Sat, 19 December 2015 16:42
		Re: Fully restored all-Swiss watch with 24-hour dial By: MonKee on Thu, 21 January 2016 17:32
		Re: Fully restored all-Swiss watch with 24-hour dial By: Thojil on Fri, 22 January 2016 18:14
		Re: Fully restored all-Swiss watch with 24-hour dial By: JackW on Sat, 23 January 2016 03:07

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