Published in the Royal Gazette today (Volume 125, Issue พิเศษ 173 ง, Page 18) is the announcement on the upgrade of TAO Rang Wai (องค์การบริหารส่วนตำบลรางหวาย), Phanom Thuan district, Kanchanaburi Province, to a subdistrict municipality (เทศบาลตำบลรางหวาย).
To make it more confusing, there was a subdistrict municipality Rang Wai until recently, but that was renamed to Talat Khet (เทศบาลตำบลตลาดเขต) - though this rename was apparently not yet published in the Gazette. Talat Khet covers the central part of the subdistrict, dating back to a sanitary district, while the new municipality covers the outlying areas of the subdistrict, thus encapsulating the other municipality. So there are in fact two municipalities within the subdistrict Rang Wai.
The rename of the central municipality was decided in meeting 42/2008 on June 8, while the upgrade of the TAO was done in the meeting 54 (July 11). According to the meeting transcript, the TAO was created in 1996, covers 54.21 km², 20 villages and 6,920 citizen. The subdistrict itself must be much older, ThaiTambon sadly does not include any historical informations on it, and I have not found any corresponding announcement on its creation.
Apparently the website rangwai.com belongs to the new municipality, Google still has a cached version where the same website is titled Rangwai subdistrict administration. But as there is no real contents on that site yet it doesn't matter much...
What is strange is the fact that while this municipal upgrade was announce just few months after it was decided, there are still many more older ones pending. And unlike most of the net yet announced status changes there was no announcement on the constituencies in this specific municipality for the municipal council elections yet.