My grandfather Adolph Schwintowski was in Prussian Army Artillery. We had a certificate with his picture on it, very delicate and cracked. I don't have the dates because in one of my moves while in the navy it was lost. Still hurts. He was born in Krotchin and migrated to United States about 1893 we have his Prussian passport from Kingdom of Prussia.
Is any record available about his service?