Most of the better crystal ( older) will have some lead content.
Do you actually use them every day?

Lead crystal is more sparkly than cut glass and is heavier than it looks. You can use them just don't store liquid in them. It is very hard to tell from a picture, but they look like cut glass to me.

If they are crystal decanters, they will have lead. Make sure you do not store drinks inside. Fill them in before serving the drinks and empty after the party is finished.

Leaded crystal is perfectly safe to use. You have to understand the chemistry.

Chlorine is a deadly poisonous gas. Sodium is highly explosive. Yet you eat large quantities of both every day: table salt. The sodium and chlorine are bonded in a way that is not only safe, but necessary for your survival.

Leaded crystal is the same. Don't use them for storage, but certainly for serving and consuming.

I use lead crystal decanters. I have stored alcohol in them for years. Do you have any idea how much you’d have to drink before the lead gets you? Chances are your liver will give out long before you get lead poisoning.

You can buy lead testing kits at hardware stores to test your dishes for lead. This article is from 1991, but is an FDA warning against storing (or even regularly using) crystal with lead.

https://www.nytimes.com/1991/02/20/garden/fda-issues-warnings-on-using-lead-crystal.html

Here's a more current article or if you can't read the NYT without a subscription (I can't tell because I have one).

https://www.oregonwinepress.com/klooster-crystal

I hope that everyone keeps in mind that the liquid you are storing in those crystal decanters could kill you and at least one other person before tomorrow morning. The lead is not the problem.

Everybody goes all Chicken Little at the mention of lead, yet completely ignores the pact with the devil that we have made by consuming alcohol.

I am not--repeat, not--against alcohol. I use it myself, mostly in the form of craft beer. My only point is that we are used to alcohol and don't fear it, even though it can kill us both immediately and over the long term. According to the NIH, almost 100,000 people die in the US each year from the direct results of alcohol use (almost 10,000 by alcohol-related car crashes).

You need to familiarize yourselves in the same way with all risks and be very careful of the sources you get your information from. God only knows why you are asking about this in a design forum instead of going to the NIH, CDC, FDA, etc.

From what I've read, even if they do have lead, they're safe to serve from, providing the alcohol isn't stored in them between parties.

Actually, the 'question at hand' has no business being asked in a forum about home design. It's completely off-topic, just as it would be in a forum about car repair or animal husbandry.

The OP ticked "home entertainment" so I reckon advice about serving sherry fits right in ;)

Thanks.

I love displaying my crystal and using it to serve and entertain just the same way I would other decor and entertaining pieces.

I have a few decanters myself, one of which belonged to my great grandmother. I use them more for decor than anything else, but they have made appearances at the occasional Christmas party...

All crystal has lead. Lead is poison. Dont let the children drink out of leaded crystal.