The next oldest was Benjamin Lazrus where the company name was derived. Ralph was a salesman at heart and so handled the sales aspect of the business.
Benjamin attended Columbia University, and fought in World War I. Over the life of the company the three brothers, at one time or another, ran the company as President.
Thomas, and Virgin Islands in the late 50's early 60's.
They had top secret government contracts to manufacture timing devices for use in bombs and weapons.
They also continued to sell watches to civilians as they were still able to ship their Swiss movements by sea via Lisbon.
Unfortunately there is no way to tell if the 17 j movement is on board short of opening the case.
But in the early 1900's watch manufacturers and jewelers were soldering solid lugs to small pocketwatches, adding straps, and wearing them on the wrist. The wristwatch gained very quickly in popularity, to the point that by the early 1920's worldwide pocketwatch manufacture and sales were on the decline.
So, from this point until the "B" Revision went back to the "Corrosion Resistant" description, all metallic cases had to be stainless steel.
This is the only period in the history of the I have been able to positively identify at least two variants of the MIL-W-46374A produced with cases made from stainless steel, or, from corrosion resistant steel.
Founded in New York City in 1921 by three brothers - Oscar (d.1990), Benjamin, and Ralph (d.1960). The name "BENRUS" was a combination of Benjamin Lazrus first and last names. Since it's invention in the 16th centurey the only choice in watches was the pocketwatch.
It was at that time that three young brothers saw an opportunity to begin a wristwatch company that produced moderately priced watches for the common-man; BENRUS. He was an attorney, and he was in charge of the advertising and finances for the company.
Contrary to popular belief, Benrus, like many other watch manufacturers of the time, manufactured watches for WWII servicemen.
Most US companies (including watch companies) were brought into the war effort to produce items for military use. Indeed, Benrus was manufacturing items toward the War effort.
Benrus also had a factory in Waterbury CT which is where they made the cases for Benrus watches.