The pattern is LeMoyne star I know that. I know it is very old but around what date I am not sure. 50ish maybe. As far as cleaning I heard from a speaker I just heard recently to vacuum old quilt with a diffuser on the end of the hose, some thing like a screen. I would not put it in the washer. I might try hand washing even with the size of it and hang it or lay it out to dry if you have the room.