Dear Laura,

Thank you for contacting Mearto with your appraisal inquiry. The apprised object appears to be a painting on cork with the measurements of 15 1/2 x 21 1/2 inches. The depicts a bullfight and is monogrammed with the Initials GG and dated 1963. There is no fitting artist in motif, style, and signature mentioned in databases and reference books.
This piece is in good condition and there are no serious damages visible.
An estimation would be between 30 to 60 USD.
This estimation is based on actual recent past recorded auction sales of comparables. Retail "asking prices" can be higher and vary.

With best regards,
Georg