Can the shutter speed dial on an Argus C3 colormatic only be turned the direction of the arrow?

Or can you turn the dial either way?

I have an old 1948 C3 and I think the shutter speed dial turns in complete revolutions either direction and the dial tensions up when getting to the slower shutter speeds.

I just got another a model C3 colormatic with the older side flash from the mid 1950s in prime working order and do not know if I should turn it in complete revolutions (the arrow points counterclockwise) when setting the shutter speed.

Thank you for any replies.