We have always considered and collected these commercial masks and helmets as industries tribal art. Examples can be elegant in their simplicity or bazaar and complex. They are always unique, suprising and filled with personality.
Large Surveyor’s Transit by C. L. Berger & Sons #25017
The item for sale is an Original Vintage CL BERGER Brass Transit, made in Boston, USA. It's a model #25017 and includes the original case. This is a nice clean example and is one of the larger, heavy examples... $975