[rdmadison]

Friends,

The serial number prefix seems to correspond with the JL B code. I would be happy to hear (through PM or posting) how other 1957-69 Swift prefixes agree or disagree with makers' marks. The "TJK" looks not to be an individual maker, and yet binoculars by other importers have different letters. Perhaps a generic label for something as simple as Tokyo Japan Kogaku (I'm not convinced) or an exporter handling Swifts from different makers?

Bob

#6060 (MIOJ KOCo)

#322110 (TO)

#1-36368 (TJK)
#1-37809 (TJK)
#1-65446 (B2/E46)
#1-662957 (B2/E46

#4-158802 (TJK)
#4-199318 (TJK)
#4-637562 (B26/E45)
#4-6513400(B26/E45)
#4-6712862 (B26/E45)
#4-676364 (B26/E45)

#5-47159 (TJK)
#5-660286 (B198/E22)

#6-18217 (TJK)

#7-667871 (B32/E22)
#7-653049 (B32/E34)
#7-643031 (B32/E22)

#9-31023 (TJK)

#12-630091 (TO/B45/E47)

Identified Swift Makers (JL):

2 Katsuma Kogaku Kikai (B) possibly #1-
22 Itabashi Kogaku Kikai Seisakujo (E)
26 Futaba Kogaku Kogyo (B) possibly #4-
32 Miyako Seiki (B) possibly #7-
34 Musashi Kogaku (E)
45 Taisei Kogaku Kogyo/Tamron (B,E) possibly #12-
46 Otsuka Kogaku (E)
47 Tokuhiro Koki Seisakusho (E)
198 Tenwa Seiki Kogyo (B) possibly #5-