I searched for the same thing on google and the only thing that was similar was the family crest of Sir George Burns but without the coronet, who was a partner of Sir Samuel Cunard, Burns family crest depicted lion rampant, as is yours, holding the world globe, obviously symbolic of maritime industry, I suspect your shield will have something similar if the family name could be found.
There is a website which I have lost now but if you put into google Livery button collections, then you may get some additional help there.
There is also a section on here under Special Interests for Heraldry where someone may be able to identify the symbolism of you crest on the button.
My home town has the Blue Lion Rampant of the De Brus family, forebears of the Scottish Bruce, also depicting the maritime industry by three sailing ships.
It is only a pity that some of the detail of the has been lost from the button.
The crown is above the head not on it.
Some really interesting finds.
James