VTG PRIMITIVE OVAL TIN CHEESE GRATER  KITCHEN TOOL 4"x3"x2".  
This zester is unmarked and dates to the mid 1900's. It measures approximately 2 1/2" tall x 4 1/8" long x 3 1/4" wide. These early graters make great decor or even a durable tool for use. It does have a few rust spots. See all photos.