Yes that's a Hella/DIN style polarity sensitive DC socket. Widely available on eBay and car electrical outlets, they are far superior to Cigar lighter types having positive centre pin connection with plug and higher current handling.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone