This is a Vintage 1930s Trico Opto-Matic Lubrication Oiler No. 3 which came out of a commercial estate. It reads on the glass bulb "Trico Opto-Matic, No. 3" and on the base "Trico Opto-Matic Oiler, Trico Fuse Mfg. Co., Milwaukee, Pat. Pend., Made in U.S.A." It likely dates back to the 1930s or earlier and it is offered as pictured for display. It measures 2-3/4" in diameter x 4" in height and weighs 1 pound.