I'm compelled to make a guess based on some bits of information I've found, regarding the possible meaning of "A.G.E." and the pipe. There is significant information online about Salmon and Gluckstein, and in particular their business concerns as the family has been involved in the genesis of several important businesses in the UK (which you can read up on using the links below if you're interested).
The question is: what do the initials "A-G-E" have anything to do with Salmon and Gluckstein. According to the history, by the time this pipe was manufactured the Salmon and Gluckstein tobacco concern had become, in fact, Abrahams & Gluckstein.
"In 1870 a difference of opinion concerning the sharing of the profits resulted in the firm's dissolution. Henry Gluckstein and Laurence Abrahams went on to found Abrahams & Gluckstein, cigar manufacturers of 26 Whitechapel High Street, while Samuel Gluckstein formed a partnership with his two sons Isidore and Montague Gluckstein."
The later advertising seemed to retain reference to Salmon & Gluckstein, although I haven't researched in sufficient depth to clarify the motivations or business arrangements that made this possible. I can imagine, for starters, that the renowned name of Salmon & Gluckstein still carried some clout in terms of advertising.
Perhaps "A.G.E." stands for "Abrahams, Gluckstein ...." and "E." I couldn't find a partner whose last name ended with "E," nor a registry for "Abrahams & Gluckstein Enterprises" or anything similar. What I did find was that Gluckstein, or specifically H. (Henry) Gluckstein, liked to be referred to by the title
esquire (Esq.), which leads me to the flimsy conjecture that "A.G.E." is an acronym for "Abrahams and Gluckstein, Esq."
What remains is to find a document or other bit of evidence on which any reference is made to "Abrahams and Gluckstein, Esq." in relation to their pipes and tobacconist business. Without that it's still just a best guess gleaned from bits and pieces.
The images below were published in British periodicals a few years earlier than the pipe above was manufactured.
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search.lma.gov.uk
en.wikipedia.org
www.salmonandgluckstein.com