Original French M1833 Naval Boarding Dirk with Original Scabbard Century Research indicates that this vessel

Research indicates that this vessel was an East Indiaman merchant vessel

With the end of the Cold War in 1992 Soviet military equipment subsidies ended and Vietnam began the use of hard currency and barter to buy weapons and equipment

It's more than likely

The blade shows much of the original factory final polish grind cross grain

There is also the name FEND in paint under the rear skirt

Original French M1833 Naval Boarding Dirk with Original Scabbard Century Research indicates that this vesselOriginal Item. Only One Available. This is a scarce example of the French M1833 Naval dirk. Manufactured using blades from obsolete socket bayonets at the Manufacture d'armes Chatellerault, around 24,000 were produced for use by boarding parties. In October 1915, 10,500 of these dirks were issued to French troops as trench daggers. This example is in great shape with a clear Naval anchor inspection stamp on the crossguard. The ricasso of the 6 blade