Where can you find information about a 5-shot Forehand Model 1900 double action with an owl on the grip?

Are you sure that is not an Iver Johnson? What are the other markings on the gun? sales@countrygunsmith.net Forehand Arms was bought by Hopkins and Allen in 1903 and that company made some revolvers marked with the Forehand name. But the Model 1900 and owl trademark are both Iver Johnson marks. I suppose IJ could have made a few with that name sometime after H&A went out of business in 1915, but you probably have a "bitzer" combining parts of two similar guns.