I think this chainring is from either the 8 or 9 speed Chorus or Athena groups but I am not 100% certain (and happy to be corrected).
The BCD (distance between the centre of bolt holes) is 130mm. Please check that this is right for you before buying.
I am also selling a 52T outer chainring with 130 BCD in another listing.
If you have any questions then please feel free to ask.