Like in OS3, the OS4 series was designed to intentionally have 2 different ludlow back variations for each title/wrapper sticker/and the promo and logo stickers. We have also learned that there should be an equal number of each variation. Two back plates were used and 1/2 of the run was created using each plate so no one variation should be more scarce than another. The convention decided upon to be able to uniquely identify the back "variations" is as follows: to simply add the number of camels (either entirely or patially shown) on the back side of the card with the additional qualifier of the number of camel feet, either entirely or partially, shown.
http://postimage.org/image/wkeaodt7h/The variation on the above picture on the left can be designated 1c4f (for 1 camel, 4 feet)
The variation on the above picture on the right, 2c4f (for 2 camels, 4 feet).
VAR 1 VAR 2 STICKERS TITLES:
------- ------ -------------------------------------------------------------
2c5f 2c8f Atomic Fur Ball
1c4f 2c4f Bark-O's
3c4f 3c8f Barrel of Flunkies
2c4f 4c9f Battleaxe
3c0f 3c4f Beetmans Gum
2c5f 4c9f Bitter Gnomes in Garden
3c4f 3c8f Cap'n Clobber's Punched Crunch
1c4f 3c0f Count Chalkula
2c5f 3c8f English Weather
1c4f 2c4f Feebles
3c4f 3c8f Hicks Farmula 4H
3c0f 3c4f Hips Ahoy!
2c5f 4c9f Kong Vitaman
1c4f 3c2f Lame Creme Rinse
3c4f 3c8f Larva Lite
2c5f 3c8f Leaden Bagels
1c4f 2c4f Lifer
3c0f 3c4f Mellow Ghost
2c4f 4c9f Moody Ring
2c5f 4c9f Norsemen
1c4f 3c2f Not Goodie
2c4f 3c7f Now & Never
3c0f 3c4f Pet Schlock
1c4f 2c4f Pig John's
2c4f 4c9f Pssssssd
1c4f 3c0f Sloshed Puppie
2c4f 3c8f Sneezing Yellow Honkers
2c4f 4c9f Sufferin'
1c4f 2c?f Sweetar
3c4f 3c8f Tinder Vittles
2c4f 4c9f Transylvania Frightbulbs
3c0f 3c4f XRay-O-Vac
2c4f 4c9f Yackety Package Poems
1c4f 3c2f Wacky Wrapper Sticker: Wacky Ads
3c4f 3c8f Wacky Wrapper Sticker: Die Cuts
2c5f 4c8f Wacky Wrapper Sticker: Yellow text on Red
3c4f 3c8f Wacky Wrapper Sticker: Red text on Yellow
2c4f 3c8f Wacky Wrapper Sticker: Yellow text on Light Blue (puzzle)
3c0f 3c4f Wacky Wrapper Sticker: Yellow text on Light Blue (gum)
2c5f 4c8f Wacky Wrapper Sticker: Orange Text on Orange
1c4f 3c0f Wacky Wrapper Sticker: Yellow text on Green
1c4f 2c4f Wacky Wrapper Sticker: Yellow text on Dark Blue
3c0f 3c4f Wacky Wrapper Sticker: 16th White text on Red
1c4f 2c5f Wacky Wrapper Sticker: Posters Blue text on Yellow
2c4f 3c8f Wacky Wrapper Sticker: Posters Yellow text on Blue
2c4f 4c8f Wacky Wrapper Sticker: Tattoos
2c4f 4c8f Wacky Wrapper Sticker: Patches
2c4f 4c9f Old School Logo
1c4f 3c2f Old School 5 Promo