The problem with retro games sales data is that sell-through estimates from the like of NPD/Famitsu are unreliable for those old games.
Sell-in data by the publisher is what you should look for but it's hard to get such data from them especially for decade old games (all those publishers if they still exist moved on a long time ago).
Despite my best attempts I could never build a Sega sales archive, in the same way I did for Nintendo.
I'm not even sure who within Sega today could access and know where to look for the old company accounting (where should be recorded how much of X item was sold to retailers or overseas subsidiaries).
The impression I have is that if they had to cite something today about their past games modern Sega will just look up in the Internet instead.
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