Antique sterling silver service identification

I am trying to identify the maker of a set of sterling silver from the early 1900’s. I have two possibilities. Meriden Britannia and Manchester Bros. The markings are all identical M.B.Co. Indian head and feather(Hallmark), Sterling. 11 tea spoons have a different style handle pattern and a different monogram (E G) 50% of

the other pieces have a strange engraving that I cannot make out, the rest have no monogram whatsoever.

https://www.925-1000.com/ax_international.html
Meriden Britannia Co.