This is the English logotype for <a href="https://en.wikipedia.org/wiki/Central_Bank_of_Luxembourg" class="extiw" title="w:Central Bank of Luxembourg">Central Bank of Luxembourg</a>.
Central Bank of Luxembourg
<a rel="nofollow" class="external text" href="http://www.bcl.lu/fr/publications/brochure/Brochure_BCL_EN.pdf">BCL Brochure</a>