Helicopter Sikorsky S-61B Serial 61-204 Register used by Mitsubishi (Mitsubishi Heavy Industries). Built 1963. Aircraft history and location Aircraft History n/a Mitsubishi 1963-09-06Sikorsky S-61B-2, cn 61-204, export to Mitsubishi in kit form, del Mitsubishi 06Sep63. Mitsubishi HSS-2 cn unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send