Normally you would separate different editions of the same expansion by their watermarks or lack there of. Sometimes however this isn't an option, such as in original River I and River II, which both lack watermarks. Now most of their tiles have different layouts but there are four that are completely the same.
So if you happen to be combining these two together for a game, does it mean you can never be sure if you returned those four tiles to their righful river sets ?
Luckily there is a sneaky differentiating factor that lets you separate the tiles with absolute certainty
(one that doesn't involve minute differences in sharpness of the print)The answer is
backs. Tiles from different sets have different orientation of their layout in relation to the big C on their back.
If we orient the C right side up, as it would be written - then these are the tile edges starting from north using consolidated tile reference:
River I vs River IIspring fsff ffsf
river turn ssff fssf
river turn with road ssrr rssr
city with road and bridge rscs srsc
also River I vs GQ 11river with two cities cscs scsc
There seems to be a 1 turn clock-wise shift between all of these...
I wonder if they did this intentionally for this exact purpose. Then again, I wonder if anybody cares besides me
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