Green’s Dictionary of Slang

(Aus. Und.) ‘irons which connect…ordinary leg-chains with a bazil [bezel] riveted around each leg immediately below the knees’ (‘Price Warung’, Tales of the Early Days, 1894).

1894

‘Price Warung’ Tales of the Early Days 45: The ‘circles’ were, as a rule, in irons. ‘Clinks’ and ‘Trumpeters’ were rather regarded as Ring insignia.