Here are four composition insulators most likely of British make - I know some these were exported to Australia and New Zealand. Actual postage additional - insulators as follows:

Cable top - dome recess embossed 2B // PC DCL E (matches style U-1606 used in Uruguay) - just a wire rub in the wire groove. -- $20

terminator style - top recess embossed T5 - inner skirt flake -- $10

terminator style - top embossed GPO "up arrow admirality mark" 33, base chip on back -- $10

Large cordeaux style -- top embossed T/E 29, small base chip/nibbling -- $10

Or take all four for $40 plus actual postage (medium flat rate will be $13.45)