There are two types of sticker paper backing. The American and the Japan sticker sheets have a lightweight, thin, and fragile type of paper. The U.K., German, and Taiwan sticker sheets are thicker, heavier, and more durable.

Location of serial numbers on standard sticker sheets:

AMERICA: top right. (But I also have a variation in which the serial number is in the middle right square. See here.)

JAPAN: top right.

U.K., GERMAN, and TAIWAN: bottom left.

CANADA: bottom right.