Hello, I have 2 belt buckles with the same hallmark(s) that are being discussed on this thread. The 1st one I bought in the early 1970’s while traveling through Cannonville, Utah. I bought it new and was told at the time that the piece was made by Leo Harvey. The second piece I bought in the early 90’s at a trade show in Denver, Colorado. The “LH” on the older piece has the sawtooth “L” while the 2nd piece has a typical “L”. Both pieces were done by Leo Harvey (or a member of his family business) as the styles are very unique. I believe that this may be the missing piece to this puzzle and that Leo Harvey is the silversmith that you have been trying to identify. I have kept my eyes out over the years hoping to find something on the internet that would help memorialize Leo’s work as I am a great fan and I recently ran across this article that was written by his granddaughter. As a side note, Leo is the grandfather of Sheldon Harvey, an award winning modernist Navajo artist who attributes his grandfather as being a strong influence in his life as an artist. Please see the link below and attached pictures of my Leo Harvey pieces with the two slightly different hallmarks. I hope this helps. Warmest regards…