This evening I was digging through some boxes of old gun parts that my dad left behind, and found this Buehler scope base. Based on some quick Internet research, it appears to be called a Micro-Dial base and the code "HVU" indicates it is for a "HVA or S.R. Mauser". I assume that HVA means a Husqvarna, but I'm not sure what "S.R. Mauser" refers to. I found a few for sale online, and it looks like there is supposed to be an adjustment wrench for the micro-dial; but I don't see it in the box. Does anyone have any experience with these, and how well do they work?