You have some NICE GLASS, and yes the 7X42 is beginning to look like an endangered species, the format appears to be made by only one major company, which is the Leica Ultravid, and if I see a 7X42 FL mint, I will pay for it. I lucked out with my FLs 8X42 and 8X56, FL the 8X56 new in box and the 8X42 mint, stored since the owner got the 8X32 at the same time, and just kept the 42 in storage, the date of 2011 still on the box. I paid less than 1100 for the 8X42 and a bit more for the 8X56. Unfortunately I paid almost retail for the 8X32, but for me the easiest glass to travel with. To get these, (not including the 8X32) in mint condition or new, is not easy.
The BN is one I would like to view in 7X42.
Regarding the 7X42 FL, I think the size is the same for Loutec 7X42, and it is shorter than the 8X42 likely by design.
I truly enjoying viewing with these FLs.
Andy W.