Lovely powder blue Satin glass miniature oil lamp with chimney. There is no matching top or globe. The pattern is drape or petal. Base is square shaped with rounded corners.  I believe it is Pittsburgh Lamp Co.  The base is 8" tall to top of chimney by 3.5" wide.  No chips or cracks. Shows some white material from the inside. Probably needs good cleaning. Neat old vintage or antique oil lamp.