Hi Jeff.
As Battara has noted, this is from Luzon. Many of these Luzon wavy-bladed knives were brought back to the U.S. by servicemen serving in the Philippines post-WWII. It appears that most were manufactured in Central Luzon, near the major US Airforce Base (Clark AFB) and not far from the large US Naval Base at Subic Bay. A lot of US soldiers passed through these bases during the Vietnam War. The hilt style on this one is a little different from the usual Central Luzon examples, and it might be a bit older.
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