An always repeated question is about the Malteser Cross, that Vacheron&Constantin patented 1880,
as a symbol for it's brand.
The question, why ?, has not been answered but the most probable, which I believe,
is that the idea is sprung from the so called Malteser Cross in the movement.
This is to stop breaking the barrel to be overturned and brake the mainspring.
This before the aoutomatic watches, when the barrel was fastened in the outer rim of the barrel,
nowadays on automatic watches the mainspring isn't fastened att all.
If it was it would risk breaking, now it just runn along the barrel when it's fully winded.
The stop device on the underside of the barrel, the malteser cross, which from the beginning was four,
on both this illustrations it's five.