OK, weights seperated as requested with pictures. This weigt, 3"x2"1/4 clear glass with cobalt blue swirl having a silvery inner lining to the swirl with minute silvery bubbles like very fine dust and blue changing to white towards the centre with top inclusion resembling an 'asteroid' with silvery bubbles. If I had to describe this weight in a word it would be 'cosmic'.
Pic 2 hopefully showing the raiset ST with 1979 below on the pontil and below again the engraved number 5.