Yes Sue, the polished pontil is in the centre and is very wide in diameter (5cm) . There are 10 very thick & deep ribs to the underside of the cap of the mushroom which extend down the stem and underneath the stem to the base. These ribs (half an inch thick ) have been smoothed out towards the base of the stem (where it balloons out ) and have been polished flat (almost ) to the base...hence the star shape to the base.
It's really a lovely piece, it would be interesting to know the exact date it was made (either pre or post WW2 I would guess)
Thanks for the photo Keith.
Carolyn , you could try Maple Syrup

Thanks all, very much, for your comments and for having a look ! Cheers, Mike