I'm obsessed with the accuracy of mechanical watch. I'm fascinated with how a mechanical watch can attain an accuracy as good as a quartz and how the second hand sweeps continuously and smoothly.
My first Grand Seiko from Japan is a automatic, I'm not at all impressed with it accuracy, it gains more after 9 months although it eventually got regulated to an acceptable range.
I had concluded that spring drive is the way to go.
During my holiday in a small town in Malaysia, I came across a brand new SGBA003, the authorised dealer gave me a very good discount, as good as I get it in Japan, maybe even better. I bought it. It's running slightly more than +1 sec per day. I'm impressed.
.....then few weeks later, in the pre-own market, I came across a full set SBGA111. The deal was too good to walk away. Even though wife is grumbling, I bought it. This watch is even better. It is less than +1 sec per day! I hardly notice any drift !
I think for limited edition watch, Seiko use a better crystal.
Now, I'm the proud owner of 2 Grand Seiko Spring Drive.