LW Kranz (Braunschweig) Petzval Lens

I recently acquired an L.W. Kranz lens but have no good idea of what I really have.  Examples of other lenses by this maker I found on the web have a number engraved either above or below the maker's name, but the one I have does not.  It's 14cm tall with a 7cm diameter of the lens itself, as you can see in the photos.  I would really appreciate any information you can provide, such as the model number, year made, and if possible, the value of such a lens in today's market.  

Thank you,

Ben

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