This is a sturdy Viking 434B Push Petrol Mower.  I personally can't get it to start but I know absolutely nothing about mowers (except, of course that they cut grass, which at the moment this one doesn't!).  

It may work well (with the right knowledge) or not perhaps at all so I am selling for spares and repairs to be on the safe side.  It has been garage stored.  Buyer must collect.