These photos aren't of my SKN guns as these are better than the ones I have of mine on my computer. One of mine has an additional marking which I've seen on a few of the later SKN guns, it's marked NEW 7-56, quite why it would be marked new in July 1956 I have no idea.

Attachment 56951Attachment 56960Attachment 56959Attachment 56958Attachment 56957Attachment 56956Attachment 56955Attachment 56954Attachment 56953Attachment 56952Attachment 56961