Hello Tim
Gaunt used a large variety of backmarks over the years and it is very difficult to pin any down to a precise period (unlike some other makers who changed addresses and used these as backmarks).
The backmarks you list are all consistent with a First World War time period in my view but they were used both before and after the war, so it would be almost impossible to link one particular button to the war using a backmark.
The more information on the backmark, the earlier it tends to be. As David pointed out Gaunt were using a simple 'Gaunt London' backmark in the 1970s at the time they reproduced so many buttons and this is a dead give away when seen on buttons purporting to be First World War period - Royal Munster Fusiliers and Royal Dublin Fusiliers are two that instantly spring to mind but there are many, many more.
Stick with J' R Gaunt & Son' and variations thereof and you can't go far wrong.
Regards
Roger
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