The 1955 specimen threepence comprise of the bulk of the collector threepence struck in 1955 with a mintage of 733 out of the total of 1044. It features a fully sealed cartwheel finish with complete strike but lacking the depth of the proof strike which has a nearly full mirror finish.
The 1955 specimen threepence is the more common of the two 1955 collector threepence though it is by no means common with a total mintage of just 733 pieces.