I actually stopped wearing my 6138-0017 "UFO" because I just didn't like the bracelet (and it was original!). It was flimsy, stretched out, and I just wasn't thrilled with it at all! While Seiko made some outstanding watches, I believe their bracelets were often sub-par. So, I decided to produce a bracelet custom-made for this classic chronograph.
It is a heavy, solid-link bracelet with brushed metal, security clasp, and a truly awesome fit! It is 18.7mm wide at the lugs, has removable links (with pins) and 3 holes on the buckle for micro-adjustment. Fits up to a large wrist.
So far, I have been able to confirm this bracelet will work on:
One bracelet and one pair of spring bars