How did you pinpoint it at exactly 1957? I can see BRIT.PAT but the number is blurry. Also I don't see a MADE IN ENGLAND inscription on the bottom plate, which in most cases means it is made in Germany.I just kind of flipped and ordered this from Bulgaria.It's apparently a 1957 British HD rocket.I just threw it on the credit card like it was nothing i'll be on soup for a month.I just had to have it it looks mint.It says it should arrive by 4th march so i'll post some pics when i get it.