For better or worse, here's a link.
The quality was abysmal last time I installed them in the 80's. I did several rooms for several clients with old Victorians who wanted to restore them. Staining and varnishing them is the achilles heel; unbelievably labor-intensive work, done after fitting. I installed them fully light-proofed with all abutting edges rabetted, such a nightmare with unsquare old openings.
Casey

Here is a link that might be useful: Horizon Shutters

Thanks so much. Boy they sure have gotten expensive and hard to find! I remember the guys complaining about how hard they are to install.