Typical southern México (Oaxaca) probably like mine, made by A. Aragon, Oax, the grip/guard is their style. The etched blade & fancy scabbard is also typical. They still make them there in Acapulco. see:
http://myarmoury.com/talk/viewtopic.14851.html.
http://www.vikingsword.com/vb/showthread.php?t=14327
http://www.vikingsword.com/vb/printthread.php?t=7485
(If you see the nasty photobucket watermark on the images, it's because I cancelled my account when they wanted an exorbitant fee. Right-click it and select 'View Image'.
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More info:
Aragón, Armando
Casa Aragón is one of the oldest cutleries from Mexico that still makes knives in the southern state of Oaxaca. This business goes back to 1750 when the great great great grandfather of the actual owner, Guillermo Aragón, founded the cutlery in the city of Ejutla in Oaxaca. They forged swords (actually machete-swords) greatly appreciated because of their resistance and cutting capacity and also because they were extremely flexible. Back then, they used carbon steel and nowadays they use 420 stainless steel made in Saltillo, Cooahuila (also in Mexico).
Mine: Blade is not the more typical one like yours. (they use machete blades). Sadly mine lacks the cool scabbard. Modern ones are stainless steel, older ones made from working machetes are carbon steel, and usually chromed.