According to ML the strap is "veritable lizard". Their weakest part is around the buckle where they end up breaking. This is dry weather so the skin is shrinking, you can see that at the lugs end where the pin can be seen and there's some looseness. But this about 15 or 16 years after I swapped the strap the last time. Before that, when I used that watch on a daily basis, the strap didn't last more than a couple of years. They're very expensive, or that's what I remember, by those days I was a very poor resident.
I don't own a single mechanical watch that stays in the +2/-2 seconds month. I'd say that not a single one stays within that range a day. Some, like one of the Zeniths, are very sensitive to the position I leave them on the table at night. If put flat on its back it stays in the -3/+1 range, but if left resting on the side, it can get as slow as -10 seconds/day. In the winder it remains in between those values. I'd love checking a Spring Drive Grand Seiko.