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The caliber 120

Guild movement; Thu, 20 June 2013 00:57

I dont have a lot of information on this one but someone once said a picture is worth a thousand words.... Razz
23.75mm diameter or 10 lignes (10 1/2 lignes per Bazzab)in size, 15 jewels and the movement number is just visible beside the escape wheel.


The caliber database | 6 comments

The caliber 835

Guild movement; Mon, 17 June 2013 19:26

The Gruen 835 was made by Aegler starting approximately in 1924. It is also known as the Rolex 200 or Alpina 835. It is a 6.75 x 11" 15 jewel 4 adj movement bearing patent #+97101. All are marked with the movement number just below the balance wheel. EDIT: I understand that the 835B has interchangeable parts but apparently is a slightly different size. Still trying to find out more info on the 835B

I've got 3 different examples here with slightly different markings:


The caliber database | 0 comments

Raised Dial Markers on Quadron

Sun, 16 June 2013 16:36

I have attached pictures of a Quadron that I picked along the way. This dial is different fro me because all the lettering / numbers are raised off the dial. I have not seen this in my short collection time. The middle of the dial seems to have a sterling silver insert as the finish / texture is different.

I would appreciate any help on this dial identification?

Happy Fathers Day to those dads who have so carefully crafted and nurtured the little people in their lives.

Model name : Gruen Precision
Type : Quadron
Period/date : 1930's
Gender : Mens

Case Maker : Pioneer
Case Material : Gold Filled
Case Serial : 75481
Case Style no :

Caliber : 123
Movement Maker : Gruen
Movement Serial:706445

Bracelet : N/A

Other info :


1930's | 1 comment

The caliber 707

Guild-era movement; Sat, 15 June 2013 16:11

The caliber 707 is a 15 jewel movement and is 12-1/2 ligne or 28.4mm in diameter. The caliber 713 is a 7-jewel variant of this movement. Although these are commonly marked on the pillar plate with the caliber number, usually in the space between the escape wheel finger and the balance wheel, occasionally they are unmarked.
Photographs by MikeyT.

The caliber database | 1 comment

The caliber 440

Curvex movement; Sat, 15 June 2013 16:01

The caliber 440 is 17 jewels and is 8-3/4 x 9-3/4 ligne or 19.4mm x22mm. It is the third Curvex movement that was produced by Gruen and shares parts with the caliber 430 and 435. This caliber is clearly marked with the number in the space between the barrel bridge and the balance cock.
Photo by ArtB

The caliber database | 0 comments

The caliber 330

Curvex movement; Sat, 15 June 2013 15:54

The caliber 330 is 17 jewels and is 7-3/4 x 11 ligne or 17.2mm x 24.81mm. It is the second Curvex movement that was produced by Gruen. This caliber is usually marked with the number next to the mainspring barrel on the exposed underside of the top plate.
Photo by ArtB.

The caliber database | 2 comments

The caliber 410

Thu, 13 June 2013 20:47

This is the caliber 410, a 17 jewel movement that is 10.5 ligne or 23.7mm in diameter. Almost all parts will interchange with others in the 405-series. The only difference between the 410 and the 420 is the size; other wise it is fully interchangeable. These movements are always marked with the caliber number in the space next to the balance wheel and the cap jewel for the escape wheel.
Photo by timeliz (Thank you!)

The caliber database | 3 comments

The caliber 426

Thu, 13 June 2013 12:56

The image (from MikeyT) is the caliber 426, a 15 jewel movement that is tonneau-shaped and 9-3/4 ligne or 22mm in size. The caliber number is clearly stamped next to the balance wheel on the pillar plate. This is similar to the 425 (17-jewels) and like others in the 405-caliber series interchanges almost completely with the other 15-jewel versions.

The caliber database | 0 comments

"In the beginning..." (1877 Hunter model Pocket Watch)

Wed, 12 June 2013 15:31

...there was Columbus. Motivated by Art I thought it would be interesting for you WW folks to understand how it all started.

Model name : Pocket watch Laughing
Type : Hunter model
Period/date : 1877
Gender : Male

Case Maker : ? (No information found on "NÂș1" trade mark)
Case Material : Coin silver
Case Serial : M296
Case Style no :

Caliber : ? 15j 19 Ligne (approx. 16 size)
Movement Maker : Aeby & Landry, Madretsch
Movement Serial: 7265

Bracelet :

Other info :
Dietrich Gruen started production in 1876 under the name Columbus Watch Co.. This example is from the second year of production.
Interesting detail is the reference to Gruen's patented safety center pinion, which was a Gruen USP at the time.
The dial word mark is made up of the letters "CWCo" and has some similarity with the later "DSG" word mark.
Hand painted words on dial center most likely owners name, but too damaged to be able to read.


1910's and prior | 4 comments


1895-1903 GRUEN SPECIFIED MOVEMENTS; Wed, 12 June 2013 08:20

1895-1903 Assmann movements specified by Dietrich Gruen. Hunter and open face 18s,16s,10s. Best quality Gruens.

1910's and prior | 13 comments

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