Any pictures of the IWC cal 89 hacking lever/pin mechanism ?

Ron_W · Wed. 6:25am

Hi all,

Can you see the hacking from the movement side next or under the balance wheel somewhere to see if it is a true Mark 11 cal 89 ? I think most of the mechanism is maybe placed between the dial and plate, so where is the part that stops the balance wheel ?

Example from the web ; edit better picture

Thanks for your help !

ErichKeane · Wed. 9:56am

Yep, you can! It is better seen in this video (

) timestamp should go to ~720. It is a torn down picture where you can see it. I've taken a screenshot to show you. Also, here it is in your photo.

Ron_W · Wed. 10:02am

Awesome Erich, thanks a lot for this.
I figured that "metal angle" to be part of the base plate cut out for the balance wheel.

Many thanks !

ErichKeane · Wed. 10:06am

Ron_W
Awesome Erich, thanks a lot for this.
I figured that "metal angle" to be part of the base plate cut out for the balance wheel.

Many thanks !

You're welcome! I was fortunate to find that video, I assumed the same in that photo (particularly because the OTHER side is the edge of the cutout), but also know that it is going to be pretty tough to hide a hack, particularly when you can see all/most of the balance wheel. I was fortunate to find that video and see it torn down, which made it obvious.

See a non-Mk11 here, and you can see it is missing:

SIDE NOTE: I actually got something in addition out of this! I have an IWC 8541 on my bench right now with a busted second-hand-friction spring. They are basically unobtanium, and a previous watchmaker replaced the spring part with a bit of copper wire which had seen better days. As a result, it would run great in 1 orientation, and the trace looked like poop dial up.

HOWEVER, I see in that photo, that it appears the 89 uses the same system for the second pinion/spring! SO I ordered an 89 friction spring, and am hopeful it is compatible enough I can use it.

Ron_W · Wed. 10:14am

ErichKeane
You're welcome! I was fortunate to find that video, I assumed the same in that photo (particularly because the OTHER side is the edge of the cutout), but also know that it is going to be pretty tough to hide a hack, particularly when you can see all/most of the balance wheel. I was fortunate to find that video and see it torn down, which made it obvious.

See a non-Mk11 here, and you can see it is missing:

SIDE NOTE: I actually got something in addition out of this! I have an IWC 8541 on my bench right now with a busted second-hand-friction spring. They are basically unobtanium, and a previous watchmaker replaced the spring part with a bit of copper wire which had seen better days. As a result, it would run great in 1 orientation, and the trace looked like poop dial up.

HOWEVER, I see in that photo, that it appears the 89 uses the same system for the second pinion/spring! SO I ordered an 89 friction spring, and am hopeful it is compatible enough I can use it.

That is Karma coming your way ! Hope it fits !

I looked at so many pictures to try and find the difference in parts or construction for the hacking device as some MK 11 are not original or put together and i just couldn`t figure it out. Great you did find that video !!