521-1

The images here represent (from left - right and top - bottom)
1. The front of the box.
2. The back of the box.
3. The top of the box.
4. The top and the inner flap, with KLIKLOK trademark.
5. The inner 'side' flaps, with list of patents.

All the other 518-521 boxes I have are an 8x11 stud plastic box with a grey plate as the bottom with a paper sleeve around the plastic box.
This one is all paper.

521-1_box_front_002 521-1_box_back_001 521-1_box_end_003
521-1_box_end_flap_004 521-1_box_side_flaps_005