Many thanks Bill for remembering me, but this appears to be the same dual-scale model I already have. Got mine from Bob Shanebrook ('laser') and it's a real beauty. See my PM...
Good luck to the seller, though. Somebody should grab this. It's a fair price and these guys are a pleasure to use. Especially with that stainless steel protective sheath. Note also that bottom enclosure around the mercury bulb is removable. It mounts snugly, but also slides right off if needed.
Ken