Stay calm, this is not an outer-space invasion.

It's just a marketing stunt that, clearly, has worked since we're writing this and you're reading it. 

The reason why Old Town residents might have spotted men in full moon-mission regalia is because this month marks the 60th anniversary of a wristwatch. The Omega Speedmaster, to be exact, which became the first ever wristwatch worn on the moon when Buzz Aldrin sported his for a little lunar roaming in 1966. Armstrong had one too, but he forgot to put it on

Of the occasion, Aldrin had these inspiring words to say: "Few things are less necessary when walking around on the Moon than knowing what time it is in Houston, Texas. Nonetheless, being a watch guy, I decided to strap the Speedmaster on." (Return to Earth, Random House, 1973).

Anyway, back to those astronauts in the Old Town... Central Embassy is hosting an exhibition through Aug 29 of iconic Speedmaster models and their connection with space travel. The event kicks off tonight (Aug 24) with some special guests you won't have heard of.

There'll be seven zones spread across the shopping mall's ground floor, the last of which features 12 of the rarest timepiece's sent from the Omega Museum Collection, including the very watch worn by Aldrin. 

And now, for your enjoyment, here's a gallery of dudes sweating balls wearing space suits in Bangkok: