I took an antique wind watch to Jostmar for regular cleaning and service because they came recommended. However, the original cleaning took a week longer than promised. A broken part was missed during that cleaning (I had told them of the symptoms) and I had to bring the watch back again. It took two weeks, to fix the break. Now, I am going to have to call them again and take the watch back for a 3rd time because watch is gaining about 10 seconds a day!
Perhaps, if you need a new battery or adjusting a watch bracelet Jostmar might be able to handle it, but if you need competent watch maintenance, I recommend going someplace else.
Cons: a lot