i didn't make conkers, but teen age boys still made conkers in NYC in the say early-mid 60's..

and both boys and girls would have fights with "itch balls" the seed ball from sycamores/ London Plain trees.

these trees had seed balls a little smaller thatn the size of golf ball, and when crushed, the individual seeds had small furry barbs.. they caught on your skins, and made it itchy.