Wow, well done mate, I was giving up on getting any info on this booster and was beginning to think it was a non genuine kona item, but I knew some well informed retro Kona expert would come to my rescue. In your link Thomas, the illustrated booster from the 93 kona parts catalogue is black, but the seller did state that this was a very rare polished one as most were black. Also it states a weight of 95g which is the exact weight of mine. Cheers, i'm very pleased that I bought it now for only £8.
1998 Kona 853 Explosif, 1999 NOS Kona 853 Explosif, 1999 NOS Lynskey signed Litespeed Obed Ti, 1999 Marin Mount Vision (custom), Cannondale Bad Boy 700c Disc (everyday hack) and a 1993 Marin for the Wife. Latest build in progress is a 1993 Marin Eldridge Grade with original paint.
"Pain is temporary. It may last a minute, or an hour, or a day, but eventually it will subside and something else will take its place. If I quit, however, it lasts forever."