I bought this lens - marked R & J Beck, 11" Rect, whole Plate - with a serial number of 682 (I used to operate a Beck made MTF test rig many moons ago so I have a soft spot for their equipment). I can't seem to find any really definitive dates for when they started to make photographic lenses and this is a low serial number and so presumably an early lens from them. Can anyone point me in the right direction for dating it. (I'm hoping to have it ready to shoot with a 5" x 4" camera in just a few weeks time).
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