Hello Stuart,
In the 9/1/68 price list accompanying the 1969 Swift Instruments catalog, there are two Vulcan 7x35 models listed: Models 714 and 718. Only the picture for the 718 Mark II W.A. is shown, it having a 525 ft. FOV. I presume that you are asking about Model 714, but there are no specs for it. It's somewhat strange to see a price for a product not listed in the catalog, but there you have it. In general, Mark I binoculars were considered lower than premium, and used simpler eyepieces affording a narrower FOV.
Regards,
Ed