Hello, this item is a short blade weapon that does not correspond to a 15th century Portuguese sword, but rather appears to be a later utilitarian or possibly decorative blade, likely from the 19th or early 20th century. The proportions, with a total length of approximately 21.5 inches and a relatively wide, thick blade, do not align with known Portuguese medieval sword typologies, which typically feature longer blades, developed guards, and more complex hilts. The absence of a crossguard, pommel, and proper grip construction further indicates this is not a complete sword in the historical sense. Instead, the form is closer to a large knife, short sword, or tool blade, possibly adapted or repurposed over time. The heavy oxidation and surface wear suggest age, but not necessarily medieval origin.

The reference to engraved snakes may point to decorative or symbolic embellishment, which became common in later ethnographic, ceremonial, or even tourist oriented pieces. It is also possible the blade was modified, with the current handle being a replacement or simplified later addition. Without clear maker’s marks, consistent period construction, or documented provenance, attribution to a 15th or 16th century European origin is not supported by the physical evidence. In the current market, such pieces are generally valued based on their decorative appeal rather than historical importance. Comparable examples typically range between $50 and $150 USD depending on condition and visual interest. A reasonable fair market value for this example would be approximately $75 to $125 USD.