That microscope appears to be a Bausch & Lomb Dynazoom model with flat field objectives. It can't possibly date back to 1943 - my guess would be the 1960's. I have one of the similar Dynoptic flat field models (the Dynoptic models lack the knob on top of the head that allows the user to double the magnification of the objective). In any case, here are some considerations based on a review of the reference manual for those scopes:
1.) The manual shows B&L's address with the Zip Code 14602 for Rochester. The Post Office did not start using Zip Codes until 1963.
2.) The manual shows a Polaroid camera being used for photomicrography. The Polaroid camera was introduced by Edwin Land in 1947
IMO, you've got a great microscope. I've had the Dynoptic for about 4 years and I'm very happy with it. The images are sharp and the flatness of field is excellent.
BTW, if you don't have the manual, here is a link to it:http://www.science-info.net/docs/b-l/Dynazoom.pdf