Hi, I've only fairly recently joined this site and, as an Historex enthusiast for many years, came across this thread while searching/browsing Historex related topics.
The picture of the sprue with the unusual arms, legs and boots rang a bell... I have a kit which contains that sprue, and attached opposite the legs and boots, it includes a dolman torso and a head with cadenettes. It was packaged with the familiar white & orange card header and plastic bag (sealed with copper staples), the packet header stamped with "HUSSARD REVOLUTION" and "SERIE EXCLUSIVE". As the Hussars were amongst the first kits produced by Historex in 1963, I believe this particular issue is from around 2003 to commemorate the 40th anniversary of the company, the composition and quality of the plastic is of the type from that time, not the same standard as vintage kits.
I agree with the comments regarding the 'generic' instruction sheets, they are very vintage, before reference sheets for specific releases were introduced. I have an infantry kit with the 'generic' pages, but had not seen the cavalry one previously.
The sprue containing the body with pointed lapels, plain head, assorted epaulettes, and plain long coat-tails is odd - as others have remarked, the vintage kits usually had the head and body supplied loose and other parts on their own separate sprues. More modern releases (such as those marketed in the dark green boxes from about 1993 onwards) would have parts still attached to a main sprue. However, by then plain coat-tails had been superseded already by those with pocket details added.
Finally, I recognize the name of the thread originator, Steve Ettinger, and another poster, Barry King, from some trades completed on a well-known online auction site some years ago when I was living in the USA, good to see them here too. I'm not quite sure why somebody referred to it as "evil bay", through it I've made some great contacts with fellow hobbyists.