E-
Hmmmm... Not entirely sure what specs/differences you are looking for, but the 5514 and 1665 are two completely different animals. The 5514 is quite a bit thinner in profile and the dial aperture is also a bit smaller; the 5512/5513/5514/5517 have a dial diameter of 26mm and the 1665/1680 have a dial diameter of 26.5mm. So, on the 1665, you see more dial, per se.
I don't have my 1665 at the moment as I sent it over to a friend of mine here to check out and test drive. Once I get it back (as well as my calipers which I have out on loan to another friend of mine), I can measure and provide actual dimensions if that's what you need...