What alloy "aluminum" are bottle openers made from. There are a couple
styles.

One is quite thick, and just due to its mass it should last atleast a
little while.

The other is pretty thin. No thicker than the typical flat wrench you
receive with a power tool like a router or die grinder. Its pretty
"tough." My son has one he won for something when he was a little kid.
He'll be 26 this year. It still opens bottles just fine. Its seen some
where, and the color coating is pretty much gone on all the edges, but
he opened a beer bottle with it just yesterday when we were standing
around in the kitchen chatting.

What is the most likely alloy for that?

I'm pretty sure its not titanium. Titanium is moderately expensive, and
is considerably heavier than aluminum if not quite as heavy as steel.
Maybe one of the titanium aluminum alloys?

I have never really handled any 7075 thinner than 3/4 inch. Its strong
stuff, but it cuts easily. As easily as any other aluminum alloy I have
cut. There is little more horsepower required, but not enough that I
have to change any of my feed and speed recipes. Is it enough stronger
to be used for this application?

I've made aluminum wrenches before out of 6061. Closed ones work fine
if they have enough beef to them. Open ones don't last worth a darn.
Even if you beef them up quite a bit.

This bottle opener is the aluminum (or some other very light alloy)
equivelant of a thin open end flat wrench or single pin spanner.

What alloy of mysterium is it made of?