Type 45 Siamese Mauser

The Type 45 Siamese Mauser was a service rifle adopted by the government of Siam (now Thailand) in 1903. It was a bolt-action rifle based on the Mauser action, originally chambered for the 8x50mmR rimmed centrefire cartridge (not to be confused with the dimensionally similar Austrian 8x50mmR Mannlicher or French 8x50mmR Lebel cartridges). It was later upgraded as the Type 66 rifle and chambered to fire the 8x52mmR cartridge with a Spitzer (bullet).

The Type 45 refers to the year 2445 in the Thai calendar which corresponds with 1903 on the western Gregorian calendar.