Thanks for the suggestion- I've got a pretty good folder solution right now, but I'll take a look at it.

I remember the Bowen belt-buckle knives available in the '70s... then it was only what I now assume is the "wide" version, and they were fairly easy to spot- the website you pointed out looks to be much more sophisticated. With the "rounded" option and various belts, it is probably much harder to spot. The "money belt" adds other "carry" possibilities.

Interesting. Thanks again.