1959 American clipper crystal

Hi all, 

I'm new here and I recently acquired a L9 American clipper mens watch. I am new to the watch repair game, still very much a noob. I am looking for a replacement crystal for the watch as the old one is cracked. I have been searching for a replacement with no luck. Can anybody point me in the right direction on where to find one? I did get the old crystal out and measured it. It is 26.5mm round. Thanks for any help