What is a Sneak Luger?

[Rev03FFL]

There is an interesting Luger on GunBroker, advertised as a "Sneak" Luger.

I looked it up in Kenyon's book - has a whole chapter on these.

This one appears to have a sear safety that has been removed. There are 2 small holes drilled over the sear and on top of the side plate. Would this be something I would expect to see on such a Luger?

Also there is a unit marking "LKZ 99" on the front gripstrap. Anyone know what this means?

So are these Sneak Lugers more or less collectable than others? Without many of the usual markings, are they more susceptable to fakery?

The markings on this one look correct based on Kenyon's book, and it appears to be fairly represented to my untrained eyes. Though I don't like the emphasis on the "1892". Seems like someone unfamiliar with Lugers might think this is a date, not a s/n.

The link is:

http://www.gunbroker.com/Auction/Vie...?Item=44967937

Not that interested in bidding, just wanted to learn a bit more about these Sneaks.

Thanks