Who has the highest SLG percentage ever?

I'm curious, could you tell me who holds the record for the highest slugging percentage in the history of baseball? It's a fascinating statistic that I've always been interested in, and I'm eager to learn more about the player who achieved such an impressive feat. Is there a particular era or league where these high slugging percentages tend to be more common, or is it a rare accomplishment regardless of the time period? I'm looking forward to hearing your insights on this topic.