Robert Justman stated that there was no ship-specific emblems in TOS, it was rather split by the classification of postings:
Starship (or Heavy Cruiser, if you prefer) (Enterprise, etc.): Cochrane delta
Spaceship (auxiliary craft like the Antares): Lopsided heart with oval
Outpost and Colonies: Sideways oval/fin
Cadets: Silver Flower (as seen on Finnegan)
Starbase: Gold Flower (as seen in "The Menagerie" and elsewhere)
Flag Officer: Bow/Knot (as seen on Commodore Decker)
The weird thing is that the Defiant crew (as seen in "The Tholian Web") wore Cochrane Deltas in TOS, but for ENT in "In a Mirror Darkly" they were given a special emblem (sideways fin). It is speculated that the costumer for ENT was operating under the "every ship gets its own emblem" theory.
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