The Master's badge was subscribed for by Past Masters, designed by E Alexander Young, and created in 1936. The centre-piece disc is a replica of the original Master's badge which was a medal produced by R Mills, Master in 1837, inscribed CAMPANOLOGIA and R MILLS 1837. Above that is inscribed the year the Society is said to be founder, 1637. The two gold figures on either side represent a man in 1637 attire and a man in 1937 attire. They stand on a based inscribed VIVAMUS SIT PERPETUUM UNANIMITER ("Let us live together with one accord"). Above the inscription "THE ANCIENT SOCIETY OF COLLEGE YOUTHS" is a gold image of the reclining against a bell with a book, that appears on the membership certificate. The badge is attached to the ribbon mountings via two images of the mace head. The ribbon mounts themselves feature two sets of three heraldic shields. From left to right these shields represent Lord Brereton, St Paul's Cathedral, Sir Richard Whittington, City of London Priory Church, St Mary Overie (now Southwark Cathedral) and Sir Henry Tulse.

Until the year 1936, the Master's badge of office was quite a small affair, not originally designed for the purpose. In 1837, at the time of the Society's bicententary, the Master was Richard Mills. The Society at that time was at a low ebb and, in an endeavour to improve matters, he offered a silver medal to each of the band who should ring peals of Oxford Treble Bob Major, Royal and Maximus. The first set of these medals was won by a band who rang a peal of Oxford Major at Newington in 1840. James Mash was one of the band, and his son, George, afterwards presented hs father's medal to the Society. It was this medal which was used as the Master's badge, and is now worn by the Immediate Past Master. On the obverse, surround a bell, are the words CAMPANALOGIA .R. MILLS, MASTER, 1837" and on the reverse "SOCIETY OF COLLEGE YOUTHS ESTABLISHED A.D. 1637."

This was also one of the Richard Mills medals of 1837, normally worn with a red ribbon.

This was also one of the Richard Mills medals of 1837, normally worn with a blue ribbon.

At the Society's business meetings, the Master uses a gavel with a head carved in the shape of a bell, inscribed "Junior Society of College Youths, 1820". This Junior Society was founded in 1820 to supplement the work of the older Society, surviving until 1839.