I've had this GUDOL Quart Oil Bottle for the better part of 35 years. I have never been able to find a thing about this brand.
The round GUDOL Motor Oil S.A.E. 40 decal has been applied to a Harper & Shields bottle. The large S.A.E. 40 marking toward the top is also a decal. Comes with a very good condition, The AMCO Corp, New York/Chicago spout and cap.
The price is $95, plus shipping. Your personal or business check, or a money order are welcomed for payment. John