This unusual 100 Proof and 100% Agave tequila blanco from Don Fulano is from an older bottling with the metal look label. Hi-Time does show a 100 proof Don Fulano in stock but I believe it's the newer, though elegant screen printed version. At 50% alcohol, tequila like this is often referred to as Fuerte (hard).

The picture above was taken by Lou Barton but he did sell me this bottle.