Crystal Needed for 1925 ladies 6724 watch

I misplaced the cyrstal for a Ladies Bulova identified by the panel as a 1925 6724. The watch is posted on MyBulova with a drawing of the crystal. The crystal would be a rounded rectangle approximately 21.6mm x 12.4mm.  DarHin searched and thinks it might be a GS P390 crystal. Any help is appreciated.

 

Thanks  Ken S