Trying to understand differences between calibres 30110 and 30120, the only difference I could find is the following:
30110: motion-work s4,61 / m1,90 / h1,04
30120: motion-work s4,61 / m2,15 / h1,29
Does anyone know the significance of this?
Thomas
Hi Thomas,
The higher 30120 was designed as a direct replacement for the gilded 37521. It was mainly used in the Portofino 3513 and only produced from 2003 to 2005.
The lower 30110 was designed as a direct replacement for the gilded 37524. It was initially used in the MK XV and DaVinci SL, also from 2003 but is still in production as its lover profile enables it to be used in many more models including Ingenieurs, Pilots, Aquatimers and newer Portofinos.
Leo
P.S.
The reason behind replacing the gilded 37524 + 37524 with the nickeled 30110 + 30120 was a wish to emulate the movement finishing and decoration of historic IWC automatic movements like the 852 or 8541 on modern IWC movements
Thanks, Leo!
The 30110 is in an Ingenieur (ref 3239) I recently purchased and the 30120 in an Aquatimer (ref 3290) that I'm waiting on.
From your explanation, I am now thinking the hour hand sits 0,15 mm and the minute hand 0,25 mm higher from the dial side movement plate on the 30120.
Is this correct?
What would be the reason for this? Could it be the design of the hands or the higher water resistance of the Aquatimer?
Do you know if this is the only difference between the movements or if there are more?
Thomas
Edit: On second thought. My interpretation of the numbers as the position of the hands in mm distance from the dial side movement plate would mean there's well over 2 mm between the second hand and the minute hand. This seems an awful lot so I'm sure that I'm missing something.
Hi Thomas,
I didn't know the 30120 had been re-released, thanks for the update.
The hands are indeed higher. In my opinion, this reflects the fact that there is a greater distance between the dial and underside of the crystal on the new Aquatimers due to the internal rotating bezel. It would look strange if the hands were too close to the dial. It has nothing to do with water resistance.
There are no other differences between the movements.
The height of the second hand is governed by the pipe that attaches it to the second wheel so there isn't a 2mm gap. The second wheel is the same in both movements.
Leo
Thanks, Leo!
It makes sense that with a deeper dial the hands would be higher (and perhaps a bit thicker).
After reading up on motion-works (TimeZone: The Motion Works), I'm now thinking the cannon pinion and hour wheel are higher/thicker on the 30120. As far as I understand, the 30110/30120 are direct center seconds movements. What I'm still struggling to figure out is how this works with the same movement height and same second wheel and shaft for the second hand.
Thomas
Hi Thomas,
As per my last post
"The height of the second hand is governed by the pipe that attaches it to the second wheel"
This means that the same height second wheel can be used on both movements with the hand used on the 30120 having a longer pipe to raise it above the higher cannon pinion.
Leo
Ah yes. I misread this above. Now I understand. Thanks a lot for explaining, Leo! Much appreciated!
Thomas