This is a crown type, no. 0, for a smaller engine, and would probably work well for a scale model engine. Feed mechanism is a needle valve with a swing arm which can be locked to adjust oil inflow. Device for locking swing arm has a patent date 1889. Bottom has threaded end which appears to be a standard size plumbing (npt) fitting in 1/4-18 size. Overall length is about 4-1/8 inches (10.5 cm). Item is in excellent condition. Brass exterior has some light bumps. Glass is good. I disassembled & cleaned it, but the lower glass chamber still has residue on inside; i just cannot get inside it to clean it. Cork gaskets appear fine. Item should work as it is intended.The item “An 1889 LUNKENHEIMER Brass Engine Oiler, Crown No. 0, Swing Arm, Hit Miss Model” is in sale since Wednesday, May 13, 2015. This item is in the category “Business & Industrial\Light Equipment & Tools\Stationary Engines\Parts”. The seller is “antiquesplus4u” and is located in Elyria, Ohio. This item can be shipped worldwide.