Sterling swaptions: Volatility by the pound

A lock for preventing the loss of a cuff link comprising: a sheet-like body having portions thereof which are flexible and including a U-shaped portion having a base and a pair of generally parallel legs extending from the base, a coplanar tongue extending from the base and having a portion thereof disposed between the legs, the tongue having a neck portion adjacent to the base and a lock portion extending from the neck portion, the legs bounding the lock portion on either side and in close proximity thereto so as to provide a pair of slits, the width of the neck portion being smaller than the width of the lock portion thereby providing a pair of apertures bounded by the legs, the base and the neck.