Dear Michael,

Thank you for your help and patience.

The presented object appears to be a print on paper with the measurements 67 x 41 cm. The print depicts an abstract composition in blue and is not signed. 
Sadly no additional information about an artist fitting in style and motif is given by reference books and databases. This print was made in the second half of the 20th century.

Comparable objects were recently offered and sold on the international auction market. 
This piece is in good condition and there is no serious damage visible in the images provided.
A fair market estimation would be between 50 to 100 USD.
This estimate is based on actual recent past recorded auction sales of comparable items. Retail "asking prices" can be higher and may vary.

With kind regards,
George