Bsa Mini Freewheel - 14t (1/8").
With its special design this freewheel with 14 teeth can be mounted on a hub
Normal with BSA thread (1.370 "x 24 TPI) has been designed for the smallest version 16T which can be mounted on hubs with BSA thread
for all freewheels with 16 teeth else you need hub with the special metric BMX flip-flop thread (M30x1)
Since due to design very wide (about 23mm), it does not fit on all Hub with BSA thread, possibly stands on. the axle about Mallorca