What does 鉛筆とメモ look like on HTC?

On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.

When did HTC add 鉛筆とメモ?

HTC first drew 鉛筆とメモ in Sense 7, released 2015年3月30日.

HTC Corporation has shipped 2 versions of 鉛筆とメモ. Each is dated, so you can see when the design changed.

HTC

HTC Corporation has drawn 鉛筆とメモ 2 times. Every revision HTC has shipped is below, newest first.

What does 鉛筆とメモ look like on HTC?: On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.
When did HTC add 鉛筆とメモ?: HTC first drew 鉛筆とメモ in Sense 7, released 2015年3月30日.
How many times has HTC redrawn 鉛筆とメモ?: HTC Corporation has shipped 2 versions of 鉛筆とメモ. Each is dated, so you can see when the design changed.

HTC artwork for this emoji spans 2015 to 2016.