This is the first watch I purchased from OF. The strap was in better condition than the puctures suggested but probably needed replacing. I originally put it on a bracelet but did not like it as much so I used the original strap. The chances of finding an original replacement were slim but good things come to those who wait and I was lucky enough to find a replacement all be it in red rather than blue. I even found an old magazine advert showing this model with the red strap. It was only today that I finally got round to putting on the new strap. I think I will wear this one for a while. Here she is on her original strap and now with some red treds on and here is the advert from a magazine. The ad is for the chronostop driver but on the right hand side is a picture of the larger seamaster chronostop.
Every AD, OB or watchmaker can do it in 1 min, no need for service for demagnetizing. However since it happened often to me I bought this one : You can get them on eBay from 10$/€/£ further.... Hope it will solve the problem...