Hi, We live in a condo that was once an early 19th century manor house. We do not know how old the windows are, but the cranks appear to be antiquated brass cranks (that need polishing). One of the cranks is broken, and we are interested in finding a replacement for it. The base of the crank measures 12 and 1/2 inches. A photo attached.
Thank you for any help you can offer!