Typically to become a trusted watchsmith here you need to have a Certification 21 (I checked into it....)
I am a hobbyist and have become very familiar with the non-chrono ETAs, 6497s, and some Seiko movements. Next up is the 4130 once the service book arrives!
I also have a 3K 5167 incoming so I will have to dissect that one too!
I have no idea what a certification 21 is but ill let steve know. To be honest, hes not really that bothered either way. Obviously more work is nice, hassle not so much.
Its fun taking watches apart though isnt it! Im very confident with 2824’s and 2836’s now, but my criteria for watches to work on are:
A. I need to own them, preferably more than one.
B. Parts need to be available.
As great as it would be to be a master watch maker, im pretty happy with being able to service and repair the 10 or so 28xx watches i have. Other stuff like chronos and tourbillons i just send to steve! For now... haha!