Lovely cameras, VisualDarkness and Taipei-metro!
VisualDarkness, I wasn't aware that you could get an Autocord with a Citizen shutter that ended at 1/400. The site that had the information about models and years appears to have gone down.
The last series (Autocord Standard/I, II, III, and CdS-I, CdS-II, and CdS-III) came with or without an excellent CdS meter. These had a snap-on neckstrap and a Citizen shutter with speeds up to 1/500. The Autocord II/III and CdS-II/III could take 120 or 220 film. I think these models came at the very last, 1964 - 1966. (Taipei-metro, yours looks like it's an Autocord Standard/I, possibly a II if it can take 220 film and has the 1-12 counter go around twice.)
Earlier models had the Chiyoko name, took a standard neckstrap, and had a top shutter speed of !/400. I think Citizen made the shutters for all of the later Autocords, so yours may be from the early 1960s, possibly late 1950s.
Sorry I can't provide more specific information.
- Murray