Congrats on the nice Chase. Whether the holder says 1 or 9, its a beaut. I can't comment on regrading it other than to say I think you should save your money on buying more vintage cards, but if you are going to sell it then maybe try on regrading.
Welcome back to the hobby! BTW, the hobby is no cleaner now IMO than it was in the 90s so you still have to do your homework, but this forum is a great place to get other hobbyist opinions.
Rob
