The bright color of this ad and its matching envelope caught my attention immediately, but after reading it it occurred to me that I have never had anything produced by Zenner-Raymond until now. The ad is complete as you see it, printed only on the front, and fits inside the envelope which measures 3-1/2"x6". Love the bold exterior message: Zenoleum Sheep Dip Is Not Poisonous." The postmark reads Detroit April 28, 1898 -- the ad was created from an 1897 study conducted by the State Agricultural College at Fort Collins, Colorado. Nice addition to an agriculture collection [ AG. / NAT. HIST.]