You are bidding on a Bird Thruline wattmeter, meter only. It is scaled 0 to 15, and 0 to 250 watts. So, it is not a replacement for a Model 43 meter. I do not know what model it fits. It is good, and measures 3 1/2 inches in diameter at the top and 2 3/4 inches below the panel. It is measures 1 3/4 inches deep below the panel. There are two Trimpots on the back for calibration. It has a screw connector as shown in the photos. It should be useful for someone. Shipping weight is 1.5 pounds. Please see my other listings for more interesting radio and audio items, and tubes.