I only bothered to collect the major variants and never really got into the COO differences. These are the main ones I picked up.
Notable Kenner Variations:
* Luke Skywalker Farmboy orange hair - Kenner
* Luke Skywalker Farmboy double telescoping saber - Kenner
* Han Solo white moulded legs painted black - Kenner
* Jawa vinyl cape - Kenner
* Tusken Raider hollow cheeks - Kenner
* Blue Snaggletooth - Kenner
* Leia Bespin gold neck - Kenner
* Han Hoth tan moulded legs - Kenner
* Lobot one white arm - Kenner
Notable European variants:
* Walrusman light green head and hands - Euro Variant / "Mecanno"
* Luke Skywalker X-Wing Pilot dark orange hard torso - Euro Variant / "PBP"
* Boba Fett light blue - Euro Variant / "Tri Logo"
* Imperial Stormtrooper Hoth Battle Gear YPS Rifle - Euro Variant
* Rebel Soldier dark brown - Euro Variant
* Bossk hard torso big lips - Euro Variant / "PBP"
* Bossk bright green limbs - POCH
* Luke Skywalker Bespin Fatigues dark brown boots - Euro Variant
* Cloud Car Pilot white face hard torso - PBP
* 4-Lom red tinted armour - PBP
Notable Foreign variants:
* Stormtrooper Japan COO & screw in back - Takara
* Chewbacca dark brown - Lili Ledy
* Boba Fett dark blue - Lili Ledy
* Yoda dark green - Made in Mexico / "Lili Ledy"
* Squid Head red brown cape - Lili Ledy
* Bib Fortuna burgundy coat - Lili Ledy
* C3PO removable limbs matte gold - Glasslite
* R2D2 Pop-up Saber red eye matte dome - Glasslite
* Blue Stars - Uzay
Group shot of some of my favourites