A friend has a very rare shotgun and would like to know if someone can give some light....

It is a very old damascus shotgun made by J Nowotny of Prague.- Very nice with many details. I was not aware of this name.

The most strange thing is that left barrel has a complete rifling with a 40mm long chamber, and the right barrel has straight rifling with a 70mm chamber!!!!

I have never seen a 40mm long chamber, not have I seen a straight rifling.

Little more can I say, I include as many photos as I have been able to make (I was in a hurry)

Any idea on such strange details?

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