Want list :

Switzerland :

Rear temp. plates :

AG (US format with Z)
BS (US format with Z)
OW (US format with Z)
SH (US format with Z)
UR (US format with and without Z)

Motorcycle plates :

Temp m/c white without Z     : AG, AI, BS, GL, GR
Temp m/c white with Z         : AG, AI, AR, BS, GE, GL, OW, SG, SH, VS
Temp m/c yellow without Z   : AG, AI, AR, BL, BS, GE, GL, GR, NW, OW, SZ, VD, VS, ZG, ZH
Temp m/c yellow with Z        : AG, AI, AR, BS, GE, GL, GR, OW, SG, SH, UR, VD, VS, ZG

Other :

CD, CC, AT (other than GE)
Agricultural plates (green or older series) 

Old series :

1900-1927 (white on black) => sample

1927-1932 (black on white) => sample

1932-1950 (with big shields) - except FR, SH => sample

1932-1976 Dealer plates (with red script) => sample

1977-2001 Rental plates (with V suffix) => sample

Double-sided Front m/c (1932-1957) - except AR, FR, GE, VD, SH and ZH => sample

bicycle plates before 1950.

Europe :

Andorra : old type (1934-1958 and 1958-1963 with black shield)
Austria : second world war plates, black plates with shields Wien (1946-1947), Army plate, trailer red plate.
Bosnia : new series with crest
Germany : Wehrmacht (WL – Luftwaffe / WH - Heer) – 1946-1948 Bayern (BY orange plate) – WWII (with intact Nazi seal)
Italy : Trieste with crest
Kosovo : new series with blue band and crest
Liechtenstein : temp. (US format with Z), m/c
Norway : new type with sticker and flag
Russia : all Russian republics with flag (Tatarstan, Georgia, Armenia, South Ossetia, Abkhazia…)
Slovenia : temp green plate, foreign worker (yellow on black)
Guernsey, Jersey (British Channel) : with left band and crest
Ukraine : new type with flag and blue band
Vatican : CV and SCV

USA (horse and airplanes plates)

Arizona (Navajo tribe)
Arizona (Grand Canyon - the golden rule)
Florida (horse country)
Florida (the horse state)
Florida (discover Florida’s horse)
Maryland (Harley Owners Group)
Minnesota (home of ice hockey)
Montana (Hockey)
Montana (youth Hockey)
Nevada (Reno Air races)
New York (Regional  - Saratoga Cortez)
New York (Horse Racing)
New York (NY Rangers)
New York (NY Islanders)
North Carolina (Revolutionary)
Pennsylvania (Harley Owners Group)
Texas (Southern Methodist University)

Canada

Nunavut

Mexico

Baja California Sur
Chiapas
Nayarit
San Luis Potosi
Zacatecas

Middle East

Ajman (UAE), Fujairah (UAE), Ras Al Khaimah, Syria.

Asia

Abkhazia, Armenia, Azerbaijan, Georgia, South Ossetia, Tajikistan, Tartarstan, Uzbekistan.

Africa

Comores, Sao Tomé & Principe, St. Helena, Sudan. 

Oceania

Cocos (Keeling), Marshall, Midway, Pitcairn, Tuvalu, Wake.

Carribean

Montserrat, Turks & Caicos, St-Vincent & the Grenadines.

* trade pending