Looking to identify an old National 8-pin DIP (M8440)
Date codes are YYWW so they are 35 years old. The other two lines look like a customer part number, so there probably isn't a way to find out a mfg number. However opamp pinout is standard so you could just plug it in and see if it works.
Addendum: I have found Ibias, slew rate, and Iq to be most helpful in identifying unknown parts.
The picture confirms what I said in the first two sentences. I have up voted for being the only person I have seen so far that supplied a good photo.