Dear Dave,

Thank you for contacting Mearto with your appraisal inquiry.

The presented object appears to be a lithograph or silver gelatine print on paper with the measurements of 15 1/2" by 6 1/2". This piece depict a view of the Northern German city Lübeck. It is signed by Wilhelm Castelli. Wilhelm Castelli (1901-1984) was a German photograph of architecture and for museums. This photo was probably made in the 1930s.
Works by this artist were recently not 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 30 to 70 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,
Georg