Yes, so back to my initial though that our 240 lenses are the latest ones. The B barrel is described as follows:
The barrel type ”B”, with a built-in aperture, is the only unit which is offered in all four sizes (00, 0, 1, and 3).The f-stops are adjustable in half- step click stops.This durable metal barrel can be used in those situations where additional features like the illuminated aperture, click-stop over- ride, and pre-set aperture are not required.
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