Not sure as to the authenticity of this set. However, this labelled case with three genuine barrels, numbered or not, action and stock would probably break up to over £1,500, so I would not be surprised to see it reach the lower estimate, plus a bit more.

I have a genuine three barrelled Mark II without a case and would be happy to pay at least £300 for the labelled case alone.

By the way, I have nothing to do with this item Lot and have never seen it in the the 'flesh'.