50s czy '50s?

Wg mnie obydwie są OK. Z tą różnicą, że pierwsze używane w j. brytyjskim drugie amerykańskim.

Please weigh in with your comment :)

I've only seen 50s and 50's. Not '50s. Then again, it's not really something I would pay great attention to.

I'm indifferent.
I see '50s, but can't comment on frequency.

I'm asking for no reason :) Recenlty, I have read a fresh and new copy of National Geographic, which, as it is common knowledge, is written in AmE. It was exactly in that magazine I spotted it.

widzialam wszystkie 3 wersje. 50s, 50's i '50s. Generalnie mowiac, to ostatnia powinna byc poprzwna, bo apostrof sluzy do tego, ze tam cos jest uciete...19'50s.

Mex have a read on 'the disappearing apostrophe'.