COA by Fundacion Arte Cubano, Madrid . Signed by Ramon Vazquez.
Signature: Lower Left
-Private Collection, Conecticut.
- Christies, New York, Latin American Auction, Nov. 2013, Lot 94.
About René Portocarrero
Cuban, 1912-1985, Cuba
Important Works from the 1940's-1960's of Cuban Concrete and Figurative Artists