Patent ID: 7908799

Claim:
A wall block comprising: a block body having: (a) first and second, opposite, bearing surfaces; first and second, opposite, block sides; a first, exposure, face; and, a second face opposite the first, exposure, face; (b) a locator projection arrangement on the first bearing surface; (c) a recess arrangement in the first bearing surface; and, (d) an engagement surface arrangement; the locator projection arrangement, engagement surface arrangement and recess arrangement being configured so that: (i) when the wall block is oriented in either one of two head-to-head, half-overlap, on bond, setback relationships with a second, identical, block in a section of a mortarless set back wall, the locator projection arrangement of a first, lower, one of the wall blocks, when directed upwardly, is engaged by the engagement surface arrangement of a second, upper, one of the blocks, when the second block is oriented with the locator projection arrangement also directed upwardly, to define a selected set back; and, (ii) when the wall block is oriented below, and in any one of four half-overlap, on bond, vertical relationships, with a second, identical, inverted wall block in a section of a vertical wall without set back, with the first bearing surface of each directed toward the first bearing surface of the other, the locator projection arrangement of each one projects into the recess arrangement on the first bearing surface of the other; the four vertical relationships comprising: two head-to-head, half-overlap, on bond, relationships; and, two head-to-tail, half-overlap, on bond, relationships.