That Top....
....Looks exactly like the Whirlpool gas self-cleaner I had for a while. I think they were Roper-sourced units.
Only gas range I've EVER had I could live with. It was nearly as convenient to clean as an electric range. The waist-high broiling and the storage drawer were huge pluses that also made it easier to get along with than most gas ranges.
Still and all, I prefer electric. Greatly. The drawback to the Whirlpool was that it kept eating ignitors, which trust me, FSP wasn't giving away.