Thailand released these four lighthouse stamps on 30 September 2019. The first 3 baht stamp pictures Bang-Pa-In lighthouse located on the Chao Praya River north of Bangkok. I don’t have a Google Maps view of this lighthouse. The other 3 baht stamp shows Ko Sichang lighthouse located on the island of the same name south of the entrance to the Chao Praya River. The next stamp has the inscription “King Bhumibol’s 80th Birthday Lighthouse” but the light lists call it Ranong Customs Pier lighthouse. Lastly, Kanchanaphisek lighthouse is shown. This light is located on the resort island of Phuket. This lighthouse was built to celebrate King Bhumibol’s 50th year as monarch. An unknown lighthouse is shown at the lower left corner of the souvenir sheet.
Ko Sichang L/H | Sc ?, Mi ?, SG ?, Yt ?, WADP ? | 30 Sep 2019
Ranong Custom Pier L/H | Sc ?, Mi ?, SG ?, Yt ?, WADP ? | 30 Sep 2019
Kanchanaphisek L/H | Sc ?, Mi ?, SG ?, Yt ?, WADP ? | 30 Sep 2019
Lighthouses of Thailand | Sc ?, Mi ?, SG ?, Yt ?, WADP ? | 30 Sep 2019
See all lighthouse stamps from Thailand here