This is the special limited edition of 500 watches, the 55th Anniversary model SBGR097.
It's 42mm which is not overwhelming, but bigger than most GSs.
Also featuring a steel case, transparent caseback, serial number engraved on the back, and 9S61 movement with 72-hr power reserve.
These should be arriving at your local dealer or boutique now.
Dial pattern in blue, and similar to this:
Cheers,