Oh I love that color navy blue!! I got the full size B bag model in navy blue back in January 2016. It's a great runner. I mainly got it for the color! I'm a sucker for navy blue colored machines.
The model number for my B bag unit is 1779. I also have a forest green 1784B power head canisters. Both of mine have the same style power head as yours with the headlight. My green power head--really white with green bumper and sticker, has a VGII brush roll. The blue power head I recently installed a CWP dual row bristle replacement. The CWP brush really changes the tone of the power head and I haven't decided if I like that tone now!
There's pictures of mine sometime back on this website. I don't know if I updated my profile with it or not??