It's possible that:
* It's a local or regional brand: The name "PROMISE" might be associated with a smaller lighter company operating in a specific geographical area.
* It's a generic term: "PROMISE" might simply be a common name used by various manufacturers to describe a certain type of lighter, similar to how "Zippo" is sometimes used as a generic term for all lighters.
* It's a misremembered brand name: There could be a slight error in recalling the brand name.
To find more information, I would need some additional details:
* Do you have any specific images of the lighter or packaging?
* What is the approximate age of the lighter?
* Where did you encounter the name "PROMISE" in relation to lighters?
With more specific information, I might be able to assist you further in tracking down the history and origin of the lighter.