The Palomar All-Sky Survey was carried out between 1950-1958 on the 48-inch Schmidt Telescope at the Palomar Observatory in California. Each plate is approximately 6 degrees covering an area roughly 180 times the size of the Full Moon; but, despite its age, this is still the most complete optical survey to date. Each region of the sky was looked at through a red filter and a blue filter and the faintest objects are about a million times fainter than the faintest objects you can see with the naked eye from a dark site. You can find the Right Ascension and Declination (sky coordinates) of your plate on the image. You can look more recent images of your print via Google Sky.

These plates contain all sorts of objects astronomers study. Indeed, they were in common use for deciding on interesting objects to study until the late 1980s. You may be able to see stars, star clusters, nebulae and distant galaxies in your image.