2017 MARKET UPDATE:
Two sales north of $20,000 in the past year had seen TMNT #1 back up the charts as the most valuable comic book of the Bronze Age. Then Marvel Spotlight #5 smashed that record.
Still, if you can afford the lofty heights of a CGC 9.8, it is a decent long-term bet. Most of us will probably be scratching around in the 9.0 end of the market, which is a good enough place to find yourself if you ask me.
If you look a little lower down the grade range, you'll find fools willing to pay 9.0 prices for much worse copies.
While the Turtles are not the big business they were back in the 1990s, there are still enough media crossovers to attract attention to the original (and hard to find) Mirage books, including the 2014 movie reboot and a sequel to come later this year.
1st prints of TMNT #1 are considered rare. At least, by 1980s standards, with a little under 600 unrestored examples graded in the CGC census.
Very high grade copies may not be rare, exactly, but are extremely expensive. A 9.8 will set you back over $15,000, making it the most valuable comic book of the 1980s by far.
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