Welcome to the forum. You might try posting in Bernard Levine's Knife Collecting & Identification subforum here.
https://www.bladeforums.com/forums/bernard-levines-knife-collecting-identification.691/
Looks like Diamond J, but it could be someone named J Diamond. Hard to tell.
https://www.bladeforums.com/forums/bernard-levines-knife-collecting-identification.691/
Looks like Diamond J, but it could be someone named J Diamond. Hard to tell.