Hello guys, thanks for all your feedback right there. Now I know that this bottle is an Inca Bottle. If you have one, have you ever tried scratching the black paint? I scratch the black paint of my inca bottle and it reveals a lot of tiny bubbles inside. These bubbles reflects or can be seen as gold when you fill the bottle with pure water.
I also have a gold detector and I tried to run it through my bottle, which proves that the bottle contains a mixture of gold.
I wonder about your bottles if it has this kind of composition?