Yes. Self-inking stamps that are hand-operated fall squarely within heading 9611 regardless of whether the ink pad is integrated or separate. The built-in inking mechanism does not change the classification as long as the device is hand-operated.

Electric or pneumatic stamping machines are not hand-operated and therefore fall outside heading 9611. Depending on their function, they would typically be classified in the machinery chapters covering printing or marking equipment. The hand-operation requirement is the key boundary for this heading.