Officially registered with serial number "RT607" (which is c/n 1236), but has also been reported to be c/n 826. The reason for the doubt is that HB-EOC, a different aircraft, was also officially registered in Switzerland as c/n 1236 from Apr 1948 until Feb 1955. At that time G-ALFA was also current in the UK. It is reported that G-ALFA has the serial RT607 stamped on the fuselage, which makes it c/n 1236 (c/n 826 is serial MS958).