Gerard Keizer
...that in 1930, the footballer Gerard Keizer played for both Arsenal and Ajax Amsterdam simultaneously, flying between England and the Netherlands to play in matches?
...that in <a href="./1930" id="mwBVs" rel="mw:WikiLink" title="1930">1930</a>, the <a class="mw-redirect" href="./Football_(soccer)" id="mwBVw" rel="mw:WikiLink" title="Football (soccer)">footballer</a> <b id="mwBV0"><a class="mw-redirect" href="./Gerard_Keizer" id="mwBV4" rel="mw:WikiLink" title="Gerard Keizer">Gerard Keizer</a></b> played for both <a href="./Arsenal_F.C." id="mwBV8" rel="mw:WikiLink" title="Arsenal F.C.">Arsenal</a> and <a class="mw-redirect" href="./Ajax_Amsterdam" id="mwBWA" rel="mw:WikiLink" title="Ajax Amsterdam">Ajax Amsterdam</a> simultaneously, flying between <a href="./England" id="mwBWE" rel="mw:WikiLink" title="England">England</a> and the <a href="./Netherlands" id="mwBWI" rel="mw:WikiLink" title="Netherlands">Netherlands</a> to play in matches?