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20 Baht Series 11
| Issuer | Thailand |
| Year | 1971 |
| Type | Standard circulation banknote |
| Value | 20 Bahts (20 บาท) |
| Currency | Baht (1897-date) |
| Composition | Paper |
| Size | 140 × 72 mm |
| Shape | Rectangular |
| Printer | |
| No. printed | 20,000 (1885) + 20,000 (1886) |
| Designer(s) | |
| Engraver(s) | |
| In circulation to | |
| Reference(s) | P#84 |
| Obverse description | H.M. King Bhumibol Adulyadej in full royal regalia, Garuda top left of note above watermark window. Wording in Thai. |
| Reverse description | The royal barge, Anantanakkharat, on the Chao Praya River, Bangkok. Numbers in Thai. |
| Signature(s) | |
| Protection type | Watermark |
| Protection description | H.M. King Bhumibol Adulyadej facing right |
| Obverse lettering | |
| Reverse lettering | |
| Variants | 1885 is with signatures (20,000 printed, issued)
1886 is without signatures (20,000 printed, never issued) |
| Catalog ID | 5990956820 |
| Comments | |