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Todd Schultzto see what responses others can provide. I see where there is a Jacobs listed in the Zeenut series over several years, and the 1933 Zeenut is listed as W.E. Jacobs. As for the others, there is a "Jacobs" listed in each of the sets from 1921-1925, and 1928-1933, along with a "R Jacobs" for 1927.
You may want to look at a SCD big book-usually available at major book stores although sometimes shrink-wrapped and unavailable for perusal. In the back is a chronological index of sets, which you could use to pin down what might be out there for the years your great-grandfather played, and you could look up those sets to see if he is included. It is my understanding, though, that that there was a printing snafu in the chron index of the latest edition, so navigation could be tricky.