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Home » The Gruen Model Database » 1910's and prior » Dietrich Gruen Pentagon (Ultra Thin)
Dietrich Gruen Pentagon [message #19615] Thu, 24 July 2025 18:56 Go to next message
Gary is currently offline  Gary
Messages: 2496
Registered: May 2013
Location: Seattle
Gruen Authority
Cheerleader
Model name: Dietrich Gruen
Type: Pentagon
Period/date: 1911-1920
Gender: Gents

Case Maker: Gruen Watch Company
Case Material: 14K Yellow Gold
Case Serial: 7405
Case Style no: N/A

Caliber: Unknown
Movement Maker: Patek Philippe, Lecoutre and Gruen?
Movement Serial: 150120
Bracelet: N/A

Other info: Adjusted in all positions and temperatures. 19 Rubles. Chronometer Balance and Isochronism. Stamped u.t.

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[Updated on: Thu, 24 July 2025 21:07]

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Re: Dietrich Gruen Pentagon [message #19618 is a reply to message #19615] Fri, 25 July 2025 03:34 Go to previous messageGo to next message
JackW is currently offline  JackW
Messages: 2210
Registered: May 2013
Location: Denver
Gruen Authority
Head Janitor
Site Admin
Holy cats Gary, that is a beauty!

All I know is based on hard work & writing by others. I can only aspire to augment this body of knowledge. If I am wrong it is because of my own failings. -me

"If I have seen farther it is by standing on the shoulders of giants." - Newton

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Re: Dietrich Gruen Pentagon [message #19634 is a reply to message #19618] Sat, 26 July 2025 18:14 Go to previous messageGo to next message
Jenneke is currently offline  Jenneke
Messages: 2131
Registered: May 2013
Location: Netherlands
Gruen Authority
Nice score! Like the personal touch from the previous owner with those diamonds too.

You can only waste time if you forget to enjoy it - Loesje

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Re: Dietrich Gruen Pentagon [message #20515 is a reply to message #19634] Mon, 27 July 2026 18:57 Go to previous messageGo to next message
GruenWatcher is currently offline  GruenWatcher
Messages: 7
Registered: July 2026
Gruen Apprentice

Super Nice Watch!

I did notice something off on the timeline.

The time frame says 1911-1920, but the case has a patent shape applied for (May 25, 1921) but it doesn't have the 3-7-22 patent granted date for the Pentagon shape. So, doesn't the time frame have to be at least 1921 and before 1922?

Can someone with more knowledge chime in here?

Is this the only example of these early Pentagons or are there other pictures of these? Can you post?

Also, why doesn't this watch have a VeriThin Movement?  Ideas??

Looks like this was cased in Switzerland and not CINCINNATI

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Re: Dietrich Gruen Pentagon [message #20516 is a reply to message #20515] Tue, 28 July 2026 19:16 Go to previous messageGo to next message
Jenneke is currently offline  Jenneke
Messages: 2131
Registered: May 2013
Location: Netherlands
Gruen Authority
Quote:
Also, why doesn't this watch have a VeriThin Movement?  Ideas??
Because its a Dietrich Gruen. Therefore has a UltraThin (UT) movement Extra Precision.

You can only waste time if you forget to enjoy it - Loesje

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Re: Dietrich Gruen Pentagon [message #20517 is a reply to message #20516] Wed, 29 July 2026 16:42 Go to previous message
GruenWatcher is currently offline  GruenWatcher
Messages: 7
Registered: July 2026
Gruen Apprentice
Jenneke,
 Thanks for lighting that up... I mainly focus on the American Gruen Pentagons cased in CINCINNATI.

 I grabbed this timeline:
 
 1915 Introduction of Swiss Dietrich Gruen Extra Quality/Extra Precision watches
 1917 Movement production shifts permanently to Switzerland
 1920s UltraThin and other premium Swiss pocket watch movements become established

 So from this timeline, it looks like all the UltraThin Pentagons were made in Switzerland (case and movement).

 I still maintain that this watch was made during or after 1921.

 Please post other Gruen Pentagon examples of the Patent Pending - Patent Applied for Shape markings in the case backs. Pull yours out to see!

 Thank you.

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