The whole Cosina thing is a mystery. Cosina Camera reminds me of a family member nobody likes for some reason. The Rodney Dangerfield of camera makers. This family member goes on to become a well-respected heart surgeon, but is still shunned by the family. There is a partial list of cameras known to have been made by the Cosina Camera Co out there. The last time I saw it, I saved it, updated with a couple I know to be Cosina-made cameras and it is below:
ARGUS STL-1000
BAUER RX1
BAUER RX2
CANON T60
CARENA CX-300 (same as X-300 also sold as Minolta X-300)
CARENA CX-500
CARENA KSM-1
CARENA KSM-2
CAVALIER MSTL
CHINON CE II
CHINON CM3
CHINON 5000SE
CHINON GAFL-ES
CHINON CHINONFLEX
CHINON CE-3
CHINON CS-4
CHINON CM-5
CHINON CM-7
CHINON CG-5
CHINON CX II
CHINON CP-X
CIMKO LS-1
COSINA C1
COSINA C2
COSINA CT-1
COSINA CT-1EX
COSINA CX-2
COSINA CT-1A
COSINA CT-1G
COSINA CT-1 SUPER
COSINA CS-1
COSINA CS-2
COSINA CS-3
COSINA CT-4
COSINA CT-7
COSINA CT-7D
COSINA CT-9
COSINA CT-10
COSINA CT-20
COSINA CT-90
COSINA EL SOLAR
COSINA HI-LITE
COSINA HI-LITE HDL
COSINA HI-LITE EC
COSINA HI-LITE 405
COSINA CSM
ELICAR MN-1
EXAKTA TWIN TL
EXAKTA HS-2
EXAKTA HS-4
EXAKTA HS-3
EXAKTA HS-10
EXAKTA HS-40
EXAKTA KE-5
HAKING HG1
HAKING HG2
HANIMEX DR-1
KENLOCK KG1
MIRANDA MS-1
MIRANDA MS 2
MIRANDA MEMOFLEX
NIKON FM-10
NIKON FE-10
OLYMPUS OM-2000
PANAGOR CT1EX
PANAGOR CT90
PENTAX P30T
PETRI GX-1
PETRI GX-2
PETRI GX-3
PETRI GX-4
PETRI MF2
PETRI MF3
PETRI MF4
PETRI MF101
PETRI MF102
PETRI MF103
PETRI MF104
PORST COMPACT REFLEX
PRINZFLEX SUPER TTL
QUANTARAY R400
QUANTARAY RZ800
QUANTARAY DZ-RZ
RICOH XR-1
RICOH KR-5
RICOH KR-500
RICOH KR-5 SUPER2
RICOH SINGLEX TLS
RICOH KR-10 SUPER
SEARS SL2
SEARS TLS
SEIMAX SV7
SEIMAX SV9
SOLIGAR SC-1
TOPCON AM-1
VIVITAR 220SL
VIVITAR 420SL
VIVITAR 650SL
VIVITAR XV2
VIVITAR XV3
VIVITAR V2000
VIVITAR V6000
VOIGTLANDER VSL 43
YASHICA FX-3 SUPER 2000
ZODEL 2MTL

Sometime around 6 or 7 years ago there was what looked like a complete and official list out there--pretty large and as I recall was a link posted on photo.net. I didn't save that list and the link was inactive when I looked for it a year or two ago. If anyone has it, I'd be interested in seeing it.
Jon