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Oct 1 16 11:00 PM

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Hello everyone, I could use some help with a pen drawing I found in a storage locker. I looks like a pen drawing of Nagel's "Black and White Robe". The owner of the locker was a hoarder that collected art. Nothing more than $100 to $500 but most was signed and numbered.... EXCEPT this one. I know it is highly unlikely that this is an unsigned original but I still have to ask... especially since it was professionally framed. So my question is, what signs would I look for to identify what exactly I have. Is there a type of paper or particular size that was common for his ink drawings? I would really appreciate any help you give me! Thank you. 

https://www.dropbox.com/s/6qow9oj67slo28w/SLA1%20%28429%29.jpg?dl=0