It is a bullet manufactured in Thailand by Thai Arms, a company located in Chatuchak/Jatujak, Bangkok.
According to Wiki:
"
One of the most popular police pistols is the M1911A1 .45 ACP pistol which can be found readily and relatively cheaply in Thailand"
"Thai M1911A1 pistols produced under license; locally known as the Type 86 pistol (ปพ.86)."
"The Royal Thai Army and Royal Thai Police uses the Type 86, the Thai copy of the M1911 chambered in the .45 ACP round"
So it probably came from a Thai police officer/firearm.
I'll hazard a guess that the 06 on the headstamp of GJ's photo [.45 Auto-06] is the date of manufacture - 2006.