We purchased this from the estate of magician who was very careful with his props.
It looks like he never used this one.
This unusual HALF DOLLAR coin effect is still available on the market and sells for $50.
FROM THE MANUFACTURER:
BLACKOUT! is a new utility coin that allows you to perform ridiculously clean vanishes, changes, productions and transposition miracles... right under your spectator's nose!
BLACKOUT! is machined to precise specifications by master craftsman Roy Kueppers.
It then goes through a second and third stage of meticulous handcrafting and treatment by Mike Platt.
The result of this laborious process is a unique gimmick that brilliantly overcomes the inherent problems of combining "BA" with the unforgiving conditions of close-up coin magic.
After well over a year of excruciating trial and error, Brian & Mike Platt's BLACKOUT! is here!
Perform in any black (or even partially black) shirt, pants or jacket.
Comes complete with full length DVD, and everything you need to perform ridiculously clean, impossible looking coin magic.
The manufacturer calls it "THE THUMB TIP OF COIN MAGIC". He says:
Like a thumb tip, BLACKOUT is intended to be used boldly but wisely.
Like a thumb tip, BLACKOUT is constructed to be used in close-up situations.
Like a thumb tip, BLACKOUT is not a cloak of invisibility, but a magician's tool.
Like a thumb tip, a near perfect color match with your shirt is ideal, but far from necessary.