Shown is a vintage Sangamo Type-H watthour meter, 1911 to 1914. This meter has three mounting flanges, two on either side and one on top. After cleaning it up, I wired it up to a 100 watt load and gave it the "will it work or not test", and it ran great. The bearings are still in good shape after all these years. You can't tell in the picture, but the glass has a slight SCA tint.