Not sure how a glass would sound for lead content, but pinging the glass with my finger nail gives a nice clear ring / tone (if that helps)
There is wear / tiny surface scratches around the underside edge of the foot.
No date was given for the age of the glass, I have had it for a while and had some free time today to try and find out the age of this and the other glasses I posted about to try and ID the age of them.
The foot is concave on the underside, but moe to the centre / pontil area. The top surface of the foot is not flat, but rises slightly to meet the stem.