Plain backed picture card showing I believe the 1936-37 team.
As above I'm not 100% sure of the year but a quick Google of some of the names puts it at around 36/37.
Unfortunately I have no info regarding where, when or how these were issued so it may well be the cards themselves aren't from then.
It does appear to have been cut from something as the edges aren't 100%.
Actual card shown.