Maine introduced staggered monthly expiration in late December, 1974 upon the official expiration date of the 1974 dated plate (there was a grace period through February 28, 1975 which most people took advantage of.) At this time, existing 1974-base registrations were assigned a new expiration month between OCT 75 and JUN 76 based on the last numeric digit on the plate, while new registrants from were issued new, undated plates which were validated with stickers expiring in the same month the next year.
These stickers are notable in that a different color combination was used for each individual month/year sticker. This run is a compilation of natural expiration plates displaying each unique sticker from JAN 76 (first natural expiration undated base) through JUN 88 (last natural expiration, black and white base was discontinued after 6/30/87).

1976:

January 1976*	February 1976	March 1976	April 1976
* - Some new registrants were issued leftover 1974 bases in the high 400 series as well, JAN and FEB 76 expirations from the 465 series and up and not ending in 3 or 4 are likely naturals rather than renewals.
May 1976	June 1976	July 1976	August 1976
September 1976	October 1976	November 1976	December 1976

1977:

January 1977	February 1977	March 1977	April 1977
May 1977	June 1977	July 1977	August 1977
September 1977	October 1977	November 1977	December 1977

1978:

January 1978	February 1978	March 1978	April 1978
May 1978	June 1978	July 1978	August 1978
September 1978	October 1978	November 1978	December 1978

1979:

January 1979	February 1979	March 1979	April 1979
May 1979	June 1979	July 1979	August 1979
September 1979	October 1979	November 1979	December 1979

1980:

January 1980	February 1980	March 1980	April 1980
May 1980	June 1980	July 1980	August 1980
September 1980	October 1980	November 1980	December 1980

1981:

January 1981	February 1981	March 1981	April 1981
May 1981	June 1981	July 1981	August 1981
September 1981	October 1981	November 1981	December 1981

1982:

January 1982	February 1982	March 1982	April 1982
May 1982	June 1982	July 1982	August 1982
September 1982	October 1982	November 1982	December 1982

1983:

January 1983	February 1983	March 1983	April 1983
May 1983	June 1983	July 1983	August 1983
September 1983	October 1983	November 1983	December 1983

1984:

January 1984	February 1984	March 1984	April 1984
May 1984	June 1984	July 1984	August 1984
September 1984	October 1984	November 1984	December 1984

1985:

January 1985	February 1985	March 1985	April 1985
May 1985	June 1985	July 1985	August 1985
September 1985	October 1985	November 1985	December 1985

1986:

January 1986	February 1986	March 1986	April 1986
May 1986	June 1986	July 1986	August 1986
September 1986	October 1986	November 1986	December 1986

1987:

January 1987	February 1987	March 1987	April 1987
May 1987	June 1987	July 1987	August 1987
September 1987	October 1987	November 1987	December 1987

1988:

January 1988	February 1988	March 1988	April 1988
May 1988	June 1988	Monthly expiration stickers eliminated with release of lobster base, starting 7/1/87. Exp. 1988 lobster bases used red/white month sticker (bottom left) and white/red '88' sticker (bottom right).

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