Model number is engraved on the instrument No. 34026. The instrument is solid heavy brass, and comes with its original wooden carry box. Overall good condition and well looked after for its age. Cooke, Troughton & Simms was a renowned English firm known for producing scientific instruments, particularly surveying equipment like theodolites. They were a significant company in the 19th and early 20th centuries. Dimensions: 33cm (h) x 18cm (w)