The two valve thing is not that uncommon. Usually it happens when the
first valve fails and a second one is added. It may be easier to add
one than to try to undo an old one. My mother's house had this
set-up. The first one wouldn't shut off all the way, so the new one
was added without having to shut off the water.
Use the same type as used at the meter (or the main line). They turn
on and off with a 90 degree turn. Don't have a handle but a raised
ridge for a main valve key, but if it's in an open space a crecent
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