"Please tell us the date of manufacture of this bead."

Unless one makes a bead oneself, it is very unlikely anyone would have such information. It is—like MOST modern chevron beads—a late 19th to early 20th C. Venetian bead.

"I will assume that it is Venetian."

Good call. Who else would have made it?

"Were there many of these made?"

Apparently not if I've only seen two in thirty-nine years, and you've seen none.

"How long did the revival period last?"

You're joking, right?

"What market were they made for?"

I don't know. How many markets are there?

"Why do you think it happened?"

Why do I thint WHAT happened?

JDA.