Some sets between Revised Edition and Alliances exist in two variants, one has a black dot on the back and one not. In French 4th Edition, Portuguese 4th Edition White Bordered and one English 4th Edition print run, this dot is very light and hard to see (right picture below).
IT = Italian
FR = French
DE = German
SP = Spanish
PT = Portuguese
JP = Japanese
CT = Traditional Chinese
KR = Korean
o = version with dot exists
x = version without dot exists
o x = both versions exist
Alpha: x
Beta: x
Arabian Nights: x
Unlimited Edition: x
Antiquities: x
Revised Edition: o2 x
Revised Edition Alpha cut: x
Revised Edition front cut: o
Legends: x
Legends IT: x
The Dark: x
The Dark IT: o x
Summer Magic: x
Fallen Empires: o x
Foreign Black Bordered
IT: o x
FR: o
DE: o
Foreign White Bordered
IT: o x1
FR: o
DE: o
DE front cut: o
4th Edition Black Bordered
SP: o x
PT: o x
JP: o x
CT: x
KR: x
4th Edition
EN: o x
Alpha cut: o
Front cut: o x 1
Alternate: x
IT: x
FR: o x
DE: o x
SP: x
PT: o x
JP: x
Ice Age
EN: o x
Alpha cut: x
IT: o
FR: o
DE: o
SP: o
PT: o
Chronicles
EN: o x
JP: x
Renaissance
IT: x
FR: o
DE: o
Homelands
EN: o x
IT: o
FR: o
DE: o
SP: o
PT: o
Alliances
EN: o x
IT: x
FR: x
DE: x
SP: x
PT: x
1 Extremely rare.
2 From Revised starters with clear pull tab (not sure if exclusively).