The 1953 Review programme showed a DIVER'S badge like this.
Letters indicating specialization within branches (but not qualifications).
DIVING
C Clearance Diver
This letter 'C' is very important because it signifies the only specialist [expert] divers in the Royal Navy covering deep sea and shallow waters. They were [possibly are] in great demand from every source be it NAVAL, MILITARY or CIVIL, NATIONAL or INTERNATIONAL. Members of this small but elite branch should not be confused with SHIP'S DIVERS. Ship's Divers are volunteers from the Fleet, from many branches, to train to be shallow water divers, and who are used as such when the need occurs in their ship. In addition to their main parent branch badge, they wear a divers helmet on the cuff of their right sleeve and they are paid extra money for having this extra qualification. Regrettably, they were not recognised in any of the three Fleet Review programmes being used to compile these pages.
Takes some believing, but the DIVER'S branch wasn't even mentioned in the 1977 Review programme.
