Hi Unhee,

Thank you for contacting Mearto with your appraisal inquiry.
An expert in Basquiat would need to confirm the authenticity of this work and the frequency with which he used his initials.
Based on the photos and information provided, and subject to examination, this is:

Jean-Michel Basquiat (American, 1960-1988)
"Lion," 1982
Centering a floating crowned head marked SAMO twice, the back stencil marked "NEW YORK / GALLERY," signed "Lion / 1982 / JMB"
70 by 50 inches (27 1/2 by 19 1/2 inches)
PROVENANCE: acquired from Armando Rosado at New York Gallery
$30,000-50,000* (**)
*represents a fair-market value for auction purposes; retail or asking price may vary.
**The value on this is conditional upon this work being authenticated by an expert on Basquiat. Mearto.com offers authentication services for an additional fee; please let us know if you'd like to take advantage of these additional services.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.