Puerto Rico License PlatesAll bases dating back to 73/74 are still valid.
Coqui was AAA-AKZ, with a border added at ADE. Low reported as ABY-413.
High for the Isla Del Encanto base is EDY-973.
Windshield stickers have been used since 06/91 expirations. Many old bases still have expired faded black/green 89-90 stickers displayed. Only plates issued between 06/89 and 05/90 have month and 90 or 91 stickers, surely faded to pure white by now. Apparently the switch to windshield stickers was prompted by how quickly the white/red month stickers faded under the hot Puerto Rican sun. Renewals of the 89-90 sticker never received month and year stickers -- they went directly to a pink/white windshield sticker that would be punched for an expiration between 06/91 and 05/92. Our thanks to Bernard Bandelier and Jeff Ellis for this information!