It's marked Weeden on the base and due to the condition of it, it's very hard to make out the rest that lies underneath. So I believe this to be one of the styles of the Weeden No. 17 vertical reversable steam engine, made between 1890's and 1933.
Could also be a 661, but perhaps you know more. This engine is missing a couple of pieces, namely the water glass on the side, the burner and the flywheel governor.
Hard to tell if it was the nickel plated or the brass. Has been well used and shows wear, also appears to have some mild rub marks on the boiler body. Stands 9 tall and base is 6 1/4 x 5 1/8.Please message me if you have questions, I will try to answer them, otherwise study photos for details. Would make a great restoration project if your a collector. This fragile item will be carefully packaged so it arrives safely with extra foam and rigid protection. The item "Vintage Vertical Weeden Steam Engine -Used with base" is in sale since Tuesday, May 02, 2017. This item is in the category "Toys & Hobbies\Vintage & Antique Toys\Other Vintage & Antique Toys". The seller is "taffyo40zy" and is located in Acampo, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Russian federation, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.