Good morning/afternoon/night, I bought this belt while thrift shopping for personal use, without knowing what brand it was or what material it was made of. As the pictures show, it was made by a Brazilian brand name Mixed Accessories, or Mixed Acessórios (the website says it was founded in 1990). It also has a '08' or an '80' stamp on it. My questions are: is it from the 1990s? And is the buckle supposed to be that way or it can be brighter and shiny if cleaned with toothpaste and warm water? Thanks for any insight. - J.P.