This is the M1985 sword bayonet for use on 7 mm. Spanish Mauser rifles that Uruguay purchased from FN.

Often referred to as the M1900, "M1900" is actually a collector's designation. Uruguayan documentation of this type indicates that the bayonet incorporates the blade from the French bayonet originally supplied with the converted rifles, re-hilted for use with what Uruguay designated the Mauser Español-Brasilero Modelo 1895 (Spanish-Brazilian Mauser Model 1895). The scabbard is identical to the French M1886, but is unmarked.

The cruciform epee blade is 20.5" with an overall length of 25.3".