Starfleet Ranks & Rates
2245-2265

Commissioned officers
Captain		Capt. James T. Kirk TOS Where No Man Has Gone Before
Captain Commander Lieutenant Commander Lieutenant Lieutenant Junior Grade Ensign		Capt. Christopher Pike The Cage	Lt. Cmdr. Gary Mitchell TOS Where No Man Has Gone Before	Lt. Number One The Cage
Enlisted personnel
Master Chief Petty Officer Senior Chief Petty Officer Chief Petty Officer		CPO Garrison The Cage
Petty Officer 1st class Petty Officer 2nd class Petty Officer 3rd class Crewman 1st class Crewman 2nd class Crewman 3rd class	no stripes	PO J.M. Colt The Cage

Annotations:
Two golden stripes for the rank of captain were introduced around 2265. The first officer seen with two stripes was Captain Kirk in "Where No Man Has Gone Before". Capt. Ramart of the USS Antares also wore two stripes in "Charlie X".
Based on the fact that all commissioned officers wore the same rank insignia, I assume that the same applies to CPO-MCPO and CM3-PO1.