Gretsch Switchcraft toggle PU selector switch question

It's the (Switchcraft-made) Gretsch version of the standard Switchcraft short switch. The long version usually won't work on a Gretsch due to the shorter nut threads-- It often won't reach all the way though the top.

The only real difference between the Gretsch version and the standard Switchcraft short version is is the location of the output lugs-- Gretsch has all lugs (except the ground lug) on the same side, and the Switchcraft has one pair on the opposite side. They'll still wire up and perform the same function. On the Gretsch switch, the two inner lugs are usually used as the switch output and are wired together.