What a beauty. This is the start of a very long relationship. Pretty soon it will be such a part of "you" that you won't even realize you own it anymore. It will just comfortably take its place in your life. Well done.
There were two flavors of bezel for the A/6538, the two piece and the solid "German Silver". The photo above is from Mike Woods on TZ-UK several years ago:
http://rwg.cc/index.php?/topic/126119-A-very-rare-mil-sub-indeed
http://forum.tz-uk.com/showthread.php?144861-My-new-1957-Rolex-MilSub-a-big-crown-quot-James-Bond-quot-A-6538