Nike Mercurial Vapor IX 1998 R9 15th Anniversary Limited Edition - SIZE US 11 | eBay
OG Vtg 1998 Nike Mercurial Vapor I 1 R9 Sample Cleats Sz. 7.5 Black Superfly CR7 | eBay
I believe these are the mercurial r9 from 1998. I remember having a pair with the same colorway but without cleats. For indoor soccer I believe but can't find any info online.
I custom made Ronaldo R9s 1998 Nike Mercurial Vapor's : r/bootroom
Nike Mercurial Vapor IX SE FG MVXV (Ronaldo R9 1998) - Unboxing + On Feet - YouTube
Nike Mercurial II 1999 SG Ronaldo R9 Signed Sample – Classic Soccer Cleats
Nike Mercurial R9 Ronaldo Soccer Cleats Shoes Size 2 Y Vintage Retro 1998 style | eBay
15 years with the Mercurial R9 - The original faces off with the heir