Mine's a US90-219XXX and I believe it is a 73. Your's is either a 72 or a 73 and it doesn't really matter which because to those who know them, it's an ATC90-K1 or US90-K1 (which are used pretty interchangeably).
Current Rolling Stock Inventory:
1973 Honda CL-175k7 Scrambler
1978 Honda Z50A
1973 Honda Z50A
1974 Honda Z50A
1978 Honda CB350 Four
1969 Honda CT90 K1b
1978 Yamaha GT80 (X2)
1973 ATC-90k1 (US90)
1985 ATC 70 X3 (1 rider, 1 soon-to-be-rider and 1 parts)
1996 Cadillac Fleetwood Six-Door Limousine
2001 Crown Victoria Police Interceptor
1995 Cadillac Seville SLS 4.6L NorthStar
1967 Chrysler 300 4Door Hard Top 440-4BBL
1995 E-350 Passenger Van, 460 Gas
1989 Camaro Z-28 IROC 5.0