The Her Excellency "N" was my first vintage Bulova and it is still one of my favorites. While the "N" was advertised well this one seems to have not been advertised at all (at least I haven't found anything). It also probably didn't sell very well as this is only the second one I have seen. She is very pretty and a nice addition to my Her Excellency collection. I will put a comparison shot next to the "N" and "M".
The case is 10K white gold filled. It has a 49 date stamp on the working 21 jewel movement.