Unfortunately your pics do not enlarge so I cannot make out marking. If its a cursive L or LG then its the regular Libbey commerical marking. If they are Libbey they are simply open stock commercial utilitarian grade sold by Target, Wally's World, etc. & there are hundreds of Libbey commercial utility patterns. The majority (99%) of Libbey production the past 30 years as been utility glass.