Beryllium-copper parts? Dangerous?

Hi!

First, a little background about myself. I have started dabbling more and more with disassembling, repairing (or attempting to), and assembling watches - in particular, vintage Omega and Longines watches.

Recently, I have learned that some watches may contain parts made from beryllium-copper alloys. For example, apparently, from reading some online posts, at least some sweep seconds friction springs used in vintage Omegas may be made from a beryllium-copper alloy. Is this true? If yes, is it dangerous to fiddle with any such parts?

As you might be able to tell, I am quite obsessive over potential dangers.

I look forward to all your views - whether you are a fellow dabbler, an actual watchmaker or neither.

Best
DC

Thank you so much for your views, Jim. I really appreciate it.

I should have clarified in my original post that I am not manipulating these parts in any major way. I am just wary whether there are dangerous if they were, say, scratched, marked or bent by other parts or watch tools.

Thank you so much, Dan. Both your and Jim’s replies have helped me clear my mind and confirm my own views too.