Years	Decal	Shell	Mask	Stripes L to R	Stripe Width	Mini
?-1968-?	green "UO" in yellow? oval	green	gray	none?
?-1970-?	yellow, interlocking UO. U above left of O	dark green	gray	none
?-1975-?	none	yellow	gray	green?/ white/ green?	3/8"- 1/2"- 3/8"
?-1977	green interlocking UO. U above left of O	yellow	gray	green/ white/ green	3/8"- 1/2"- 3/8"
1978-1983	green, interlocking UO. U above left of O	yellow	yellow	green/ white/ green	3/8"- 1/2"- 3/8"
1984-1994	green, interlocking UO w/ white ol. U above left of O	yellow	yellow	green/ white/ green	3/8"- 1/2"- 3/8"
1995	green, interlocking UO w/ white ol. U above left of O	yellow	green	none
1996-1998	green, interlocking UO w/ black ol. U above left of O	yellow	green	none		S
1999-current	yellow O	metallic green	green?	none		S

Thanks to Tom R. for the 1968 photo.

Oregon 1968	Oregon around 1970	Oregon 1975	Oregon 1977
Oregon around 1980	Oregon mid eighties	Oregon 1995	Oregon around 1997
Oregon 1999