When my wife was in British Columbia visiting our prospective in-laws, they were cleaning out a family house, and my son's future FIL, who has met me, asked my wife if I would be interested in having the object pictured below. She said that she was sure I would, even though nobody knew what it was.
I immediately identified it as a microscope, and after some research came up with a description as a student microscope and naturalist's field microscope, probably English, from about 1900. It is valued at about $25, so I wasn't afraid of hurting its value as an antique, and I polished it up. I also checked that it works, and indeed it does. I would estimate it at about 100x, and it gives a clear image of the subject, in my case the ridges of a nylon tie. Couldn't believe how much dirt was trapped in there!