I owned one in the mid-'60s..., click on my avatar.
Pre-dates the production HobieCat. Designed by George W. Patterson, built and sold by Alcort, Inc. from about 1964 to 1969 at which time Alcort sold its whole sailboat business to AMF. AMF dropped the Catfish in favor of the more Hobie-like Trac Cat (Windrush) licensed from an Austrailian builder.
There are a few still sailing. I see one appear on Craigslist or at SailingTexas.com every couple of years.