What does 倒退按钮 look like on SoftBank?

On SoftBank it is the design shipped in 2014, shown above at full size. Older revisions are listed beneath it.

When did SoftBank add 倒退按钮?

SoftBank first drew 倒退按钮 in 1999, released 1999年1月1日.

SoftBank Corp. has shipped 8 versions of 倒退按钮. Each is dated, so you can see when the design changed.

SoftBank

SoftBank Corp. has drawn 倒退按钮 8 times. Every revision SoftBank has shipped is below, newest first.

What does 倒退按钮 look like on SoftBank?: On SoftBank it is the design shipped in 2014, shown above at full size. Older revisions are listed beneath it.
When did SoftBank add 倒退按钮?: SoftBank first drew 倒退按钮 in 1999, released 1999年1月1日.
How many times has SoftBank redrawn 倒退按钮?: SoftBank Corp. has shipped 8 versions of 倒退按钮. Each is dated, so you can see when the design changed.

SoftBank artwork for this emoji spans 1999 to 2014.