Logo (seal version) for <a href="https://en.wikipedia.org/wiki/Century_21_(real_estate)" class="extiw" title="en:Century 21 (real estate)">en:Century 21 (real estate)</a>.
Century 21
Adapted from <a rel="nofollow" class="external text" href="http://rebrand.c21.com/images/seal.svg">seal.svg</a>