No need for backmark info. That is definitely a "Fashion" button, in this case a crude imitation of the actual US Navy buitton, made for use on civilian coats and jackets.
The main ID-clues for civilian Fashion imitation US Navy buttons are:
1- The "rope border" does not pass through the ring on the anchor's top. (See photo below.)
2- Weak/soft detail, not crisp-&-sharp detail like on actual US Navy buttons (see photo).
3- The tops of the Fashion eagle's wings are VERY round, instead of pointy-top wings like on actual US Navy buttons. (See photo.
4- The Fashion eagle's belly and legs are very fat, puffy, and round or oval. (Compare with photo below.)
Lastly, very-very few Fashion imitation Navy buttons have a maker's-name backmark. Instead, the Fashion button's back is made of iron/steel, or unmarked brass, or has a simple generic backmark like "Superior Quality."
The photo below shows an actual US Navy button. That design was used from 1850 until 1941 (when the eagle's head got turned toward the button's left side). In particular, note the very crisp, sharp detail, even showing individual "vanes" within the eagle's feathers.
