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Interested to know how many different versions there are of Mills BONUS reel strips.

Also, I see a set of BONUS strips on EBAY that have me puzzled...
I assumed that they would have had to make the "S" letter over a LEMON, because if you hit the "S" to finish the sequence and pay a BONUS of 18 coins, the machine couldn't possibly pay any other combination at the same time.
However, the set on EBAY has an "S" over an ORANGE symbol.

I have a Bonus High Top, which has the "S" symbol positioned on an Orange as well. I also am not sure why. Possibly another member will explain the variation.

For the number 1 reel there are two versions of reel strips. The B-O-N-U-S letters are in the same sequence with some over different symbols.

Here a photos for 3 Mills High top Bonus strips showing reel one variations
You should be able to save and blow up to see more clearly
cc-11-1A (80C-1A) 10-48 has the highest payout 89% over 6000 pulls including jackpots
One of the others is 85%

I have 3 BONUS machines, 1 Hightop and 2 Horseheads and I checked my strips , all have the letter S with the lemon. Slotmachinereelstrips.com has them listed as, CC-475-1,CC-407-2, and CC-536-3..

On my horse Bonus (first model with 2x10 stops), “S” is on a jackpot symbol...
Have a look here : https://retro-jackpot.fr/mills/horse-bonus/probabilit%C3%A9s