Cannot figure out who makes this youth(?) fork

Hi all, I’ve been trying to find out who makes a little 5 ½” fork that I have and where it comes from. According to the site, it looks like its one of Dutch origin. The tiny sword/keyhole-looking mark on the back looks like it has circular images inside of it, but it is truly indistinguishable with a 8 x Lupe. Also, another mark is blowing my mind. It looks like B77 or 877 or B-n or u-B, whichever way you turn it.