This is off a bridle or possibly some other element of horse furniture. Baluchistan Police were from the southern frontier with Afghanistan and may well have been a paramilitary organisation rather than a local police unit at that time, as I rather doubt that local police would have had such exotic horse furniture!

This could be a French, Dutch or even a US Union bridle boss and one would have been rivetted on each side of the bridle.

This is from the Charlemagne era. According to A. Demmin (the author of an established book on arms and armour, published 1894), there is a similar example in the Copenhagen Museum. It measures nearly 19cm across.

This form of bit would have been worn by military and civil alike throughout the period of the Crusades. In a modified form, this snaffle bit is still in use today. It is of iron lapweld construction, the central elements being hollow.