Hello Jan
Firstly, you need to amend your thread title.
It’s either Seamaster or Constellation, not both.
With some gold watch exceptions, these watches didn’t come with bracelets but they could be bought at the time of purchase as an accessory.
The type you are looking for would be a 5-row BOR (beads of rice - sometimes also called grains of rice) bracelet.
Hope that helps.
Edit
Like this one shown by
@Edward53 in this thread
https://omegaforums.net/threads/the-im-suprised-this-hasnt-sold-thread.84757/page-2Click to expand...