I just purchased a Wisner Technical Field 4x5 camera with serial number 941 stamped on the front brass plate. Does anyone know when it was built?

I have part of a clue to this question: The camera came with a Wisner catalog which states that Wisner (at the time of catalog printing) has been in business 15 years. Assuming that #941 and the catalog were approx. contemporaries, I would have a "close enough" date of manufacture.

Thanks!