1902 Siamese Type 46/66 Mauser (R.S.121) Royal Crest Rifle – 8×52R

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Offered here is an original Siamese Type 46/66 (R.S.121) Mauser rifle, manufactured in 1902 for the Kingdom of Siam (modern-day Thailand). These rifles were produced under contract by the Tokyo Artillery Arsenal in Japan, combining Mauser engineering with early Japanese military production.

This example retains its original military configuration, including the full-length military stock, Siamese tangent rear sight with Thai numerals, and the Siamese Royal crest on the receiver.

Unlike standard Mauser rifles, the Siamese Mauser was designed around a rimmed cartridge, using a distinctive magazine system engineered specifically for reliable feeding.

Specifications

Model: Siamese Type 46/66 (R.S.121) Mauser
Year of manufacture: 1902
Manufacturer: Tokyo Artillery Arsenal (Japan)
Action: Mauser bolt-action
Crest: Siamese Royal crest present
Rear sight: Thai numeral tangent sight
Stock: Original full-length military stock
Accessories: Cleaning rod present, includes what appears to be an early military leather sling

Chambering

Caliber: 8×52R Siamese

Originally designed for 8×50R Siamese, these rifles were later upgraded by the Siamese military during modernization programs.

No specific rechamber marking was observed on this example; however, historically the vast majority of Type 46 rifles were converted by the Siamese military to 8×52R, making this the most likely chambering.

Condition

Overall condition: Good military surplus condition
Bore: Strong rifling with good definition 
Stock: Original wood with expected service wear and handling marks
Metal: Honest military wear consistent with age

A crack was present in the upper handguard near the receiver, which has been professionally repaired and is currently stable.

All mechanical functions appear normal, including bolt and trigger operation.

Due to the difficulty in sourcing 8×52R Siamese ammunition, the rifle has not been test-fired.

Historical Note

Siamese Mauser rifles are relatively uncommon in North America, especially in original military configuration. Their unique combination of German Mauser design, Japanese manufacture, and Thai military service makes them an interesting and collectible piece for military surplus collectors.

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