For what it's worth, the Kit in question looks like their 4000, but was more than likely called another name as well, probably the "Prelude." The image below is from an undated Catalog that probably dates to 1988 or before, by 1989 Corder dropped the number designations and gave their Outfits non-numerical names like, "Prelude" etc...........
[IMG]http://pic4.picturetrail.com/VOL770/2917504/18227758/299812012.jpg[/IMG]
Interesting Co., it looks as is they offered the option of buying Shells & Hardware and "building" your own Kit, which they called "Do-It-Yourself Wood Shells." It appears as if they also offered full line refinishing services, which included re-cutting Bearing Edges............
To provide a little more information, the other Outfits in the same Catalog that the 4000 was in listed were the, 5000, 5500 & 6000 Series, but these were all double-headed Kits...............
LVDC