Alden built 18(a pretty good run for Alden) of these 41'6" glass hull and deck boats in the 60's and early 70's. Like the smaller Challengers built a few years before, these were glass hulls and decks layed up at the Halmatic Yard in the UK and finished both in the EU(this one, the Molich Yard in Denmark-I recognize the work), and a few at Hodgden in Maine. Some had cabins built in wood(like WIND SONG in photo), some cabin houses were built in glass).

Most were rigged as yawls but I rowed by this sloop in Rockport Harbor today.

Powerful boats with only 11' beam and full keels, they sail nicely. Spare but nicely finished below, lots of deck space and a large cockpit for sailing.