I bought an old GE Type AK1 AC Volt Ammeter on eBay the other day that I repaired and calibrated for a customer when I was a bench technician for GE on Monday, July 19th 1976. You have to be an industrial electrician to fully appreciate a test instrument like this. The AK1s were made by GE mostly from the 1940s through the 1960s and were built like tanks.
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I found this one while browsing through the AK1s and was shocked to see one for sale that had a calibration sticker from our shop in my hand writing. Time has destroyed the carrying case and wire leads, but that is ok. The meter looks and works perfectly. Of course, I had to buy it. It showed up today and it was like an old friend coming home. A friend I have not seen for 47 years.