Though already issued 1948-1954 markers could continue to be retained during 1955 and 1956, the DMV undertook a new marker program.  The general layout was as used in the 1948-1954 period, but the new style was produced in plain unpolished thick or thin aluminum with a shiny look to the surface.  This modified marker type for new registrations always used a vertical double letter prefix with an “A” over “A”, “B”, or “C” followed by four digits numbered from 1000 to 9999 and the “CT” state name abbreviation.  The numbers, letters, tab box and borders were painted black

Later in 1955 and continuing through 1956 a variant of this style was produced starting with a prefix of “A” over “D” and four digits with “CONN” on the bottom right.  This series continued with “A’ above “E” through “Z, then “B” over “A” and finished with “B” over “B” 9999.  The tab box had to be moved to the left to accommodate the additional length of “CONN”, which required more space than “CT”.  This meant that the tab box was no longer centered in the marker.