Old boxer fuze ID

[MINENAZ16]

Hello,
I try to identify the 1st fuze on the left. Graduated to 7 with different thread and reduced diameter.
The second fuze seems to be boxer's 20s and the third on the right seems to be boxer's 7.5s (see this post : http://www.bocn.co.uk/vbforum/threads/97250-Old-fuze?highlight=boxer)

 

[adrian]

As you have noted you have Boxer's 20 second Fuze & 7 1/2 second Fuze, both those fit fuze holes of Moorson gauge. The one on the left is Boxer's slightly earlier metal sea service fuze, it is also a 7 1/2 second sea service Fuze and fits the old pattern fuze hole. It does not have wrench holes in the top & has that raised square section instead. These metal fuzes were used for a relatively brief period, already going out of favour by the mid 1860s, however they stand the ravages of time & elements quite well.