I agree, it seems to fit Vega alright, but it is hard to tell from pictures. Some saddles can appear to look fine, but may have awkward pressure points when there's a rider's weight in it, and may become uncomfortable.
A 16 1/2 seat is fairly small... I'm not a big girl and I ride in a 17 1/2 inch, so it could very well be that the saddle is too small for you, and may not fit Vega well.
Can you go shopping around for a saddle just to see what's out there, and see what fits you and Vega? You don't have to purchase right now, but just see what's out there, and get a feel for what you want.
Good luck!! Saddle shopping sucks...