Levy 'boot leather' strap. Plain black, very tough but comfortable.
Schaeller strap locks. Easy to fit, better IMO than Dunlop as use a cradle system even if spring has issue. Also, pull pin to release (not push like Dunlop).
+1 on the Schaeller locks, I have some cheap copies of em and they are good, never had any problems with em.
The Schaller locks are good in some ways , but no so good in others
I like the pull to releasse rather than the push to release and the "horseshoe cradle on the strap bit seems like a good idea....
BUTWe get to see a lot of guitars come in with broken headstocks or damage - in spite of using Schaller locks.
The main problem seems to be musicians not keeping a check on whether the nut that secures the strap to thelock is done up properly.
If it comes undone, the guitar is free to fall off the strap.
The Dunlop ones secure with a circlip= musician proof (as long as you ensure the lock is properly connected to the guitar
Also if you forget your strap with the schaller locks, you have to borrow a strap and theSchaller strap buttons are tiny! (OK - not as bad as the rather pathetic ones that Gibson still fit but still tiny all the same)
The Dunlop dual design button is much bigger