Some people on the site here may know me.
My name is Darren Wallace and I have been doing restorations on disc and cylinder musical boxes for over 35 years. I specialize in Swiss gear and pinion cutting, professional comb repairs, and re-tuning. My comb work rivals that of the original Swiss makers. I also re-pin cylinders. I do all the work myself. I am a tool and die machinist of 33+ years and a musician. I have a very specialized machine shop set up to do all aspects of any type of musical box or phonograph mechanism's restoration. Many collections in North America and Europe have something I've restored in it. Many current restorers use my shop and expertise to aid in their own work too.
Your gear in your music box is a Swiss profile cut gear. The only way it can be remade is to have your complete drive train in order to test the work and do it properly. Your mechanism's gears contain dimensions that can only be calculated by having it on the work bench. Even though Swiss standards were in effect back then, many standard measurements were often altered in order to achieve the end results.
If the original gear permits, a ring gear could be made to fit on to it. I have done this in the past with great success.
I will tell you now this work is NOT cheap, and requires a considerable amount of time and effort to do it properly. Including having the correct gear cutters.
Apologies for my shameless self promotion.
Oh yeah, I restore brass era automobiles/parts too, as well as specializing in collecting F. Nicole, and Nicole Frères musical boxes.
I am located in Ontario, Canada.
Please feel free to check out my Facebook page:
https://www.facebook.com/Darrensmusicalboxes/