Hi,
Thank you all for your answers.
I happend to find photos ( below ) of a tee service with both the maker's marks ( B.A. and BA ).
![Image](https://imageshack.com/a/img924/1283/OuE8Gv.jpg)
Rather interesting, I think.
@Qrt.S - I will gladly take contact with a private message later today. And no, unfortunately I do not have the information regarding the graving.