Crystal without lead is no crystal
that is the law. I thought Schott (Zwiesel) had a "crystal"-like glass but instead of lead other metals in it (has a name that looks like crystal).
The brandies I do not trust, their history is too unclear to me, and in an other document there is a difference in the lead concentration.http://www.findarticles.com/p/articles/mi_m1585/is_n6_v16/ai_10600032
Part of the article reads.....
They found that lead began entering the liquid within inutes after being poured. Fortunately, the lead content of wine in a crystal glass usually goes up relatively little in the first half hour. During this interval, lead in wine from Irish and French crystal glasses did not exceed 50 micrograms per liter, which is the Environmental Protection Agency's current upper limit for drinking water. (The agency is in the process of lowering this level to 20 micrograms or less, however.) A set of Yugoslavian crystal glasses released lead more rapidly, exceeding present EPA limits within about ten minutes. Prolonged storage in a decanter was another story: after five or more years, lead levels in brandy had reached 8,000-22,000 micrograms per liter.
To put this in perspective, consider that lead intake from dietary sources is normally around 60--100 micrograms a day (down from 100-300 a decade ago). About one-tenth of ingested lead is actually absorbed. A cutp of wine that stood in the Yugoslavian crystal for half an hour would contain about 20 micrograms of lead -- not likely to be major hazard to the guests at even a very slow dinner party. And if glasses were rapidly emptied and refilled, alcohol would be the problem, not lead. An ounce of brandy from the most contaminated sample, on the other hand, would contain over 600 micrograms of lead -- as much as ten times the normal daily intake.
As I can only speak of the irish rystal I can only assume that the quality of the glass is also a reflection on the lead leaching. Irish crystal is considered amongst the best in the world so I would imagine it's a 'you get what you pay for' scenario. Buy cheap crystal you get a mout full of lead