It looks like a levelling tool that is normally used for end of season repairs to cricket creases, very similar to the Sisis TruLute. If anything it is a little smaller than the Sisis tool, but would achieve the same result.
As you are probably aware, during the season the ends of the cricket wickets tend to wear away and by the end of the season they normally have quite a pronounced dip behind the crease at each end, so what groundsmen do to build up the surface again to the required level is to spread a mixture of soil and clay (normally Banbury Loam) onto the worn areas, then by shuffling the TruLute backwards and forwards it will work the new soil down and level at the same time. They then sow this with grass seed and leave it over winter.
Cricket is the only game where the groundsman tries his hardest to kill the grass when it should be growing, then tries to grow it when it should be dormant. If you think your job is hard, spare a thought for the cricket groundsman!