Abstract: An anchor for use in association with a mortarless block wall system for attaching facing to the outside of a wall. The wall includes a series of blocks placed in linear courses or rows with each block containing a pair of parallel sidewalls that are connected by lateral walls and at least one upwardly disposed projection for interlocking one block to another. At least one of the sidewalls has a laterally disposed groove formed therein which passes downwardly through the top surface of the block and is located adjacent to an end face on one of the lateral connecting walls. A wire anchor is seated within the groove which has an inwardly extended locking member that engages the connecting wall of the block. The anchor further contains a forwardly extended closure key that is adapted to pass over the outside face of the block. The closure key and locking member coact, in assembly, to hold the anchor securely to the block.