Looks like a good F&BL zinc clasp to me. I had in the past a bronce grade clasp from this maker, but i am too not a special collector of flight clasps. It is always better when you make a frontal pic with a direct view from the clasp and detailed and close pics from the set up is too always fine to become more informations about the piece.
Thank you. If you click on the pics, you can see them better. I don't know why it appears so small.
And that's all the pics I have.
it looks a good zinc one F & BL.
Ok, thank you.