Bausch & Lomb made a monocular in the 7x35 configuation. After literally several decades of searching for one, I finally was able to purchase one. Its serial number indicates that it was manufactured in 1949; hence, it is coated. B&L may have made monoculars in other powers. Of this I have not seen any evidence or listed in printed material. Perhaps someone out there in bird land has some information they would be willing to share with us. The 7x35 Zephyr CF weighs 19 ounces. Without the bridge and CF mechanism, the monocular weighs less than 10 ounces, truly compact amd light.
With the eye cup removed, the user can get the full field of view wearing eye glasses. Quality monoculars are greatly underrated IMO. A number of people have lost eyesight in one eye, two relatives in my immediate family. Even for folks with two good eyes, monoculars have their place, when space, compactness, and weight are a consideration. With practice, is is easy to get a very steady view with a monocular.
The undisputed alpha, IMO, is the Zeiss 8x30 B porro monocular made over 50 years ago. Its FOV is good, and it cups in the hand like it belongs. I haven't found any porro to match its construction - similar to the old Leitz Trinovids. Zeiss designed the 8x30 B porro as either a camera telephoto lens or just a plain monocular. Regardless, it is a good example of Zeiss bringing the porro to it practical limit. Only with the newest coatings could it be improved, and then only incrementally.
John