This piece of glass has been left in my care and I am trying to identify its maker. It is a vase, approximately 11.25 inches (28.5cm) tall, 4.5 inches (10.5cm) wide. The inside color is amber and the outside is clear. It has markings on the bottom that are difficult to read but appear to be the letters M C O D. But the M could be a W and the O and D could be Os or Ds. The letters form the perimeter of a circle with two lines, forming an axis.
Thanks for any help! Really appreciate it.