Barton of Bangalore hallmark

Hello

I have found a Masonic jewel with the hallmark “Barton” and “Silver”. I’m sure it would be for Barton’s of Bangalore but I wondered if anyone knew from what era it may be from by that mark? I have had a look and can’t find any information about their marks so I thought I’d see if anyone on here might have a knowledge of the company and their marks.

Any help would be greatly appreciated.