1979 Superman figure (very rave)

Location: Wales - port talbot
Sell Price: £1


1979 superman figure
I've been told by a toy collector and specialist that this is very rare and highly collectable toy/figure,something to do with the colours with his logo >> S on his chest being inverted.
ive also done my own home work on it and can not find one with inverted S and in as good condition as mine at all!! and the prices asked on some of them are stupid and i mean they are in shocking condition.
I wanted to hold on to it but after time clutter builds up and I've been told to sell it by the boss (a.k.a the WIFE).

I can sell for

This item is for sale at £1. If you are interested please contact me.