ID on vintage/antique USA knife

[spritepath]

The maker's mark has been sharpened away. I can only see USA. Anyone recognize this maker? See 1st and 3rd pictures.

<a href="http://s347.photobucket.com/user/spritepath/media/Screen Shot 2018-04-07 at 1.49.20 PM_zpsgdwu76ip.png.html" target="_blank"><img src="http://i347.photobucket.com/albums/p470/spritepath/Screen Shot 2018-04-07 at 1.49.20 PM_zpsgdwu76ip.png" border="0" alt=" photo Screen Shot 2018-04-07 at 1.49.20 PM_zpsgdwu76ip.png"/></a>