One thing I noticed about that Holy Grail 1-18 is that, being a '79 model, it uses a different mounting rail for the Jet-Flow lint filter. Instead of the usual center mount, it's held in by the sides, which makes the basket and bed-of-nails filters non-interchangeable. Yet another side-effect of Frigidaire modifying their designs...
There are WCI Frigidaire Holy Grails as well with all-pushbutton controls, according to my literature. Made around '83 with the 4-head fill flume. The lint filter is also very similar to the 1-18 lint filter, but this time it says "Flowing Lint Filter" instead of "Jet-Flow". Very cool machines to say the least. Contrary to popular belief, these don't have plastic tubs. It's still the speckled porcelain like the Westinghouses, although they switched shortly afterward.