"Satin" Finish Greeting Card?

I have some 40s era family greeting cards which have, for want of a better description, a "satin" finish. The paper has texture felt with a thumbnail and with light playing over it it has a pattern of reflection like lace or satin. It has the usual titles, messaged and images for a Valentine from that period. Just curious if this is due to a special lithographic method or how this texture and reflectivity were achieved.