OMNIBUS 1960-1991
Historically, these plates were used on buses, taxis, livery vehicles and rental cars.
Starting in the 1970's, when unique livety-type plates were issued, OMNIBUS plates were only used on buses and taxis.
1960 BASEOWA-100 - OX?-999
The initial issue (OWA through OX?) has tab slots, but tabs were not used - the plates were validated with stickers.
Tab slots stopped somewhere in the early OX series, maybe corresponding with the start of reflectorization.
1960

1961Dave Zullo

1960

1963

1960

1965


1964

1967

1965

1969

1968

1968

1971

1969Dave Zullo

The tab slots extended into the OX- series.
Not sure where the cutoff is, but maybe OXC-100 or higher.
1969 BASEOX?-100 - OXZ-999
Some of the early OX series plates were reflectorized - from at least OXG to OXO.
1969REFLECTORIZED

STICKERED TO 1986REFLECTORIZED
Dave Zullo

1973REFLECTORIZED

1974REFLECTORIZED

1978REFLECTORIZEDSal Dodd

1971REFLECTORIZED
Lee Madigan

1976REFLECTORIZEDDave Zullo

1974REFLECTORIZED
Joe Wasielewski

The OXP series (and higher) were not reflectorized.
1974

1976/78

1982

1977

1978

1977Paul Kovalski

1979 BASEOYA-100 - OZZ-999(?)
1979Jeff Fazekas

1981

1984

1981plates.2gat123.com

1983

1985

1986

2004

1990

1992/94

1990

The highest number known on the blue base is OZR-485.