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These are known from as early as 1924, but may have been introduced the middle of 1923. The earliest of these, up through 1931 were roughly (but not exactly) the same size as a motorcycle plate and bore a “T” prefix. Those from 1927 through 1929 (and possibly 1925 and 1926) carried a small metal weight/capacity seal.  In 1932 they were increased to the same size as Passenger Car plates. If you have a Trailer plate for any year not illustrated here, please contact us!

Note: The weight/capacity seals used on these plates are commonly called “tabs” today, but during the years they were in use the only name applied to them was “seal.”

See also Rental Trailer, Prorate Trailer, Freight Trailer, and Official Trailer.
Small Trailer
A unique designation of “Small Trailer” was announced in 1954 for trailers under 1,000 pounds, with special plates for these to be issued in 1955.  The serial number on these plates was prefixed by “ST” followed by a zia and the serial number.  The plates are relatively rare, and were discontinued after only one year of issuance.


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