Hi Don,
as far as i can see, it?s a solid white gold bezel (not only the inlay).
But the lug width is the same; both reference 49920 ("John Harrison") and 49900 (42mm "Sea Hawk") come with a 21mm wide bracelet or strap.
The steel/gold "John Harrison" should be reference 49910.1.58.XXXX (XXXX is the dial code, of which several are available). It comes with a steel bracelet and to my best knowledge that one is the same as the "regular" reference 49900 Sea Hawk bracelet.
It?s a very good choice; i?m not sure about availability in other regions, but the "waffle" dial variant is a stunning watch.
Greetings,
Peter