I have never seen one that shape or color...
dosnt mean they didnt make it...they produced a large variety of lamps for over 40 maybe 50 years...it does have the wood finial...but if it is a non wood base lamp it will/should be signed at the cord hole...I currently own 2 lamps and about 20 pieces of pottery made by Marshall Studios...I love there stuff! I am friends with Gordon on Facebook...last i checked he is still making pottery and teaching in Fayetteville Arkansas. below is a link to the Marshall studio website and some catalogs!
http://www.marshallstudios.net/MS/catalogs.html
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