Mills "Mystery Payouts"

[sm1116]

'On page 18 of the catalogue "The Story Of Mills" referring to the "21" Bell as: "It's a Bell with 10 mystery payouts".
I think 4 of them are: Orange Orange Melon--Orange Melon Orange--Orange Melon Melon--Orange Melon Bar
Are there six others and what are they or is the narrative in the catalogue referring to the fact the mystery payouts
are 10 coins each?