Chalkware/plaster "bossons style" vintage plaque heads

These are old and most probably date from around the mid 1970's

Made In England

Inscribed on the back of each: Black Superman (Muhammad Ali) and the Lady is called Jasmin

I have no other info on these items, had a search on the internet but drew a blank

Measure approx 19cm and 21cm in length and 13cm across

Really great quality items but do have some paint loss in places (see photo's). 

All paint is original and hasn't been touched up.