IC Op Amp Precision 2-18V 8DIL  National Semiconductor (NOS) New Old Stock.

These LM308N opamps are all from the same batch (date code: 636).

This is a genuine new old stock LM308N, as used in the original Proco Rat pedals.

BEWARE OF FAKES! 

Unlike most other online listings for the LM308N, ours are 100% tested genuine, not cheap Chinese fakes.