We're replacing our SJ21's #1 genoa with a nylon drifter and will sell the genny cheap. As soon as the weather permits, I'll take accurate measurements and some photos. But for now here's a capsule description: Approximately 165%, high hoist, relatively stout cloth -- it will take more wind than you prolly want to be flying it in. Sail is currently set up for roller furling, with a #6 luff tape and foam luff section to permit roller reefing. Could be converted to snaps. It requires genoa tracks on the coamings, as the clew reaches past the Mk1 bulkhead. Sail is in good shape with light grass stains in a few places.
Please note: this thing is big. It has a long luff and deep draft, and it pulls like a mule. It was launching us off swells when beam reaching home from Catalina Island and we hit a top SOG of 8.3 kts -- against a 1 kt current.

It also got the boat moving when the wind was too light to keep the main filled.
If you cruise in light-air locations, this sail may spare you some motoring. If you crave thrills, it will deliver. $125 plus shipping.
Bob McGovern
(unknown hull #)
Diarmuidbobmcgov@wildblue.
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