While the 1964 Grand Seiko Chronometers are perfect in many ways (history, significance, dial, hands and indices and, above all, the handwind chronometer cal. 43999 movement, I have found it difficult to pair an 18mm bracelet or strap to the heavy lugs without feeling a sense of imbalance.
On the way out of the door to a party last night, I decided on a whim to pair 18mm endlinks with William Jean's 22mm SuperOyster from eBay. Wow - harmony! IMHO the heavy lugs combine perfectly with the SuperOyster:
On the SuperOyster, the GS is reminiscent of the 1960's Rolex Oysterdate Precision, another watch I wouldn't throw out of my bed:
(Image from beckertime.com)
Of course, a Precision would buy you about 6 GS chronometers, and you would still not have a certified chronometer, hacking, quick-set date, a solid link Oyster bracelet or a spring-latched safety clasp.
I still need to spend an hour or two tweaking the endlinks for a perfect fit, but I'm very pleased with this "mod".