At my time in the (German) navy in 1970, we had a kind of 'hard-plastic dishes" on board, besides the porcellaine ones.
It happened - wonder why? :wink: - that mostly we lower grades had to eat 'from plastic' (and some were even in an awful green colour!) , while porcellaine was just for officers and warrant officers and stayed in it's place.
The pantry, where we had to do the washing up, had a bulkhead towards the waterside.
A common saying on 'MSC WETZLAR' was:
"Flying saucers after lunch: Walter is on pantry duty."
Guess why this