I can’t help with the value, but the patent appears to be 1,348,234 entitled simply “Lock”. The inventors were J. C. Mock and B. F. Williston. The combined last names may be the source of “Willock”. The patent was assigned to John F. Fitzgerald of River Forest, IL, and his last name may be the source of the “Gerald” company. The design seems related to screw locks used by railroads, made by companies such as WRRS and RACO and Safetran.
