Activist Ekachai Hongkangwan, whose stunts regularly skewer the military regime, told AFP he was "dragged" into a Bangkok police booth while trying to give a $30 watch to Defence Minister Prawit Wongsuwan.
Prawit's apparent penchant for pricey timepieces has captivated the Thai public since earlier this month when he was photographed with a Richard Mille watch, whose models can sell for more than $100,000, and a diamond ring.
Prawit has shied away from the press since the scandal emerged, saying only in brief remarks that he was not guilty of any corruption.
Online sleuths have dug up pictures of Prawit apparently sporting other high-end brands -- including Patek Philippe and Rolex -- ticking off a kingdom fed-up with a lack of transparency under the military regime.
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"Today I came to bring a watch as a New Year's gift to General Prawit who I know is a watch lover," Ekachai told AFP.
Cops said they detained the activist for a "chat" and would not file any charges.
Ekachai was released shortly afterwards.
Critics say the case of the general's watches will likely go the way of other graft scandals under the authoritarian regime -- hold public attention for a few weeks before vanishing.
Junta chief Prayut Chan-O-Cha has stood by his deputy throughout the scandal, recently telling reporters Prawit is "a soldier and a grown man" who can handle his own affairs.
The junta seized power in 2014 after a decade of political turbulence and has maintained a tight lid on protests and dissent.
Analysts say the regime is chiefly concerned with securing its clout in politics and has made little headway in eradicating the pay-to-play culture that seeps into most corners of Thai life.
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