Lot of two pig farm competition plates

These agricultural competition plates are fun because they concern pigs; ) one is even the second prize for the travelling piggery competition ! They date from 1968 and 1969. They're made of metal. The paint, blue for one, green for the other flakes. But a small layer of spray varnish could probably stop this and maybe even give them a shine. They are 22 cm wide and 14 cm high and 0.5 cm thick. The set weighs just under 500g.