Steve noticed an odd lens flare in this photo taken before dawn along the street in front of my house. There's a curving light path near the streetlight, and there's an odd little reflection near that car - just above 'dog' in the text.
Here's the streetlamp magnified. I increased the contrast to make the arc more visible.
This is the small reflection. I haven't the slightest idea as to the origin of these. It could be internal reflections in the Yashica lens. It could be a raindrop on the front of the lens. It could be a reflection from a shiny spot inside the lens barrel. I'll experiment with other cameras and lenses.
The Electro GT is back together and usable again. I locked down the rangefinder adjustment screws with spots of clear nail polish, and I gingerly cleaned all the surfaces in the rangefinder itself. It's possible to remove the coating from a front-surface mirror even in cleaning it, so I was understandably nervous. I dipped a cotton swab in lens cleaner and oh-so-gently wiped down the surfaces. Afterward, the rangefinder window was astonishingly different! Brightness and contrast were very noticeably improved. I'm a happy camper.
Sadly, I missed out on a Yashica Lynx 14, another old rangefinder with a 45mm f 1.4 lens. It was not to be. I'll have to prowl the flea markets and garage sales come spring.