Hello from the home of Borussia, the conqueror of Bayern München (Munich). Thanks for my appointment as judge. There were so many possibilities of interpretation of "stealthy" that a comparison of watches was difficult and maybe unfair. That's why I came to 4 first places according to 4 criteria:
1. Stealthy technical appearance
It was a competition between Watchonthewrist's Urwerk, Timeout's Zenith Defy El Primero and his Bvlgari/Gerald Genta Octo Bi-Retro. At the end the octogonal case design did it. My earlier thought a stealthy appearance needs a completely black case is obsolete. And I like the Gerald Genta DNA too.

2. Hidden value/quality
As far as hidden value or quality is concerned the Credor of halkcb made the race. It hides it's value and quality perfectly behind a simple 3 hand with date appearance.

3. Unknown to the layman
Pretty unknown to the layman is claes_t's Lemania. Crucial to choose the Lemania was that until today many watch brands use Lemania movements and the watch owner doesn't know. Very tricky. That's really stealthy. I don't mean the colored chrono because it is to shiny.

4. Stealthy time display
It seems to be very stealthy to hide the display. This is when hands are not visible. The Hublot Big Bang of Hulk and Watchonthewrist's Staudt are good examples. But the Reverso Duoface of jml_watches does it best. Duoface is another word for stealth.

That's it. Have a nice week.