Good morning, FM2N;
While it may look like a "VIDOM" multi focal length viewinder, if it does not also say "Leica" and/or "Leitz" engraved on it, it is probably a Russian copy of the "VIDOM." You did say that it was in a kit with a FED-2 and some Jupiter lenses. I do suggest that there is a high probability that it is a Russian copy of the Ernst Leitz product. However, that does not mean that it is not a useable device. I have one of those here also that can go onto my Zorki-4 and Zorki-4K. It does come in handy at times.