Hatari souvenir mug

I have a Grays Pottery large mug which has a handpainted decoration of a monkey swinging from the branch of a tree, above a crocodile (which looks as if it is grinning...). Under the crocodile is the word Hatari. I was told recently that this mug was commissioned to be presented to staff who had worked on the film. Is there any Hatari expert out there who can confirm this please? Would this item be sought after by Hatari buffs/fans? If so - is there any person reading this who might suggest how I can find out the market price of this mug, should I decide to sell it? I am not a dealer. I am a Gray's pottery collector who bought this mug because it was "different". Many thanks in advance, for any replies!!