Canon Model IV Sb

Your camera would appear to be a Model IV Sb. It has the following distinguishing features:

• No Model Name on Camera
• Top Shutter Speed 1/1000th
• Has a Slow Speed Dial
• Top Slow Speed 1/25th
• Slow Speed Dial has a Lock

Dates: Dec 1952 thru Mar 1955

Produced: 34,975

Ser. Nos.:  65760 thru 160000

This was the first Canon with “X” sync for electronic flash and it was the first model to be widely accepted outside of Japan. This camera is actually a Model IV S with the addition of the “X” sync and a lock on the slow speed dial to keep it firmly at 1/25th when the slow speeds were not being used.