More than a different cut... the 49S? nb S has a beam hogging mode of oscillation and the HC49U (13mm h) has a diaphragm mode. I thin we both speak Anglisky but?
there is a slight confusion here on the size designators : and the industry she don't help none : See?https://www.golledge.com/products/hc49-leaded-crystal-with-industry-standard-package/c-26/p-239
