There are a couple hand written notes on the memo page

German and Spanish  OEM Ref

YAMAHA  MX100H 1981  Factory Owner's Service Manual

YAMAHA  Chappy  LB50C 1976  (Type 1F1 for Canada)   Factory Illustrated Parts List

Although the cover has shelf ware

YAMAHA YFA1 YFM80 YFM100 YFM350 YFS200 YFZ350 YTZ250 Tail Light 38W-84710-00 Triumph Norton BSA Rear Shock Absorbers Black Body & Chrome Springs 12 1/4 Eye to Eye There are a couple handYAMAHA Tail Light Assembly OEM Ref. # 38W 84710 00 NOS New Old Stock. W25 A Fits YFA1 1989 2001 YFM80 1986 YFM100 1987 1991 YFM350 1987 2001 YFS200 1988 2001 YFZ350 1987 2001 YTZ250 1985 1986