Looking for a mating connector for the power connector pictured. Three pins, circular, with a strange split metal shield around the center core that I presume is the keying mechanism with the mating connector. The opening is 9mm, the center core (plastic only) is 6mm, and each pin hole is 2mm (the contact will be smaller, this was again measuring the plastic not including the contacts).
My first guess of vendor would be Amphenol, since another larger connector on the backplate is an Amphenol Aerospace connector, and I assume it's a little obscure and likely expensive, but I'd love to find a match for it and from the search terms I know to use only narrows it down to like 40 pages of products, many without images, on digikey. Even just an idea of what series it belongs to would be great!