Siamese used Japanese M 1897 Type 30 Arisaka bayonet by Aisan Arsenal. (Raymond Labar Page 399)

Japanese M 1897 Arisaka Type 30 rifle.  Serial number in Siamese on the pommel. Superb bright finished straight fullered blade. Japanese Arsenal markings: Aisan Arsenal on the ricasso. Excellent deep blued standard bird's head pommel  with a serial number in Siamese crisp on the top. Perfect wooden grips secured to the blade tang with oval washers and screws. Excellent deep blued crosguard with a forward swept quillon and a muzzle ring MRD. 14 mm. 
Excellent type b. dark blued steel scabbard with some light user spurs only.

A very nice Siamese refurbished and used Japanese Aisan Arsenal produced bayonet. Aisan Arsanal produced bayonets are rather scarce.
Ref: Book:  Raymond Labar:  bayonets of Japan. Page 399)