Green’s Dictionary of Slang

marley n.

[abbr.]

a marble; usu. in pl. marlies.

[UK]N. Douglas London Street Games 111: We used to play them in the winter, on the pavement. But marlies are going down in the world, that’s for certain.
[UK]S.H. Bell December Bride 174: Will he be let out tae play marlies wi’ me?