Does anyone recognize this marking? I am assuming the case is gold-filled because of the word "Warranted," but I haven't ever seen the "B" and the Roman numeral 2.

In "Trade Marks Watch Cases Pocket Watches" by Roy Ehrhardtit shows that symbol was used by the Muhr W.C.Co. Sold to Keystone.

Tom, was the Muhr Case Co. sold entirely to Keystone, or are you saying these cases were made by Muhr and provided to Keystone? Also, would you happen to have a date the sale took place if that is what occurred? Thanks a bunch

I will see if I can find anything, in the book I looked it up in I believe they meant the entire company was sold to Keystone.

It was the entire company that was purchased. The image below is from the Jewelers' Circular 04/13/1898 which announced the sell of the business to T. Zurbrugg & Co.

From what I can find Theophilus Zurbrugg he started in the watch case business in Philadelphia, he then moved the business to Riverside NJ in 1892. In 1898 he bought Muhr & moved them to Riverside. In 1899 he merged his company with the Keystone Watch Case Co. and Zurbrugg was the President. Apparently they made both fine cases & cheap cases, the cheap ones they made under the name of the Philadelphia Watch Case Co.

He went onto to purchase the New York Standard Watch Co. to use with the Philadelphia Cases and the United States Watch Co. which was changed to the E. Howard Watch Co. (which he had bought the name) to make the movements for the Keystone cases.

Tom, as always, you never cease to amaze me! Thanks for all the great information. This particular case shows very high quality. I actually thought it was solid gold when I first took delivery. Thanks again!