Abstract: A combination lock for attache cases and the like. The lock has a plurality of movable elements for setting a combination for selectively locking the lock. A mask is provided which is spring-biased to a first of two rest positions in which the mask conceals the digits. In the second rest position the mask exposes the digits to view. The mask is disposed to mask or block a clasp element of a lock clasp in one embodiment and in a second it masks a release button for opening the lock.