4.5cm 1990s Sonic The Hedgehog Set of 4 Figures SEGA

Very rare boxed Sega set of 4 Sonic the Hedgehog figures, all approx 4.5cm tall. I cannot remember when and where I acquired these and there are no markings on the box to indicate who manufactured them. They appear to be similar figures to ones which originally appeared in the 1990s.