On the pages of the online store, Apple claims that the new straps — mono-bracelets — are not com­pat­i­ble with the old Apple Watch.

To be more pre­cise, mono bracelets are not offi­cial­ly suit­able for:

▹ “Series 0” (first gen­er­a­tion, 2015)
▹ Series 1
▹ Series 2
▹ Series 3

Since yes­ter­day, I’ve been wear­ing the Apple Watch Series 6 with both types of the new mono-bracelets: plain and braid­ed. And the first thing I did in the morn­ing was to con­nect both to the very old “Series 0” that no longer turns on. Espe­cial­ly since you asked to check exact­ly this.

To the point: I unboxed the Apple Watch Series 6 and the new mono-bracelets. First Impres­sions

So, both fit per­fect­ly. But Not per­fect.

The fas­ten­ing grooves cling nor­mal­ly, with a click. Hold tight, don’t fall out. So nom­i­nal­ly you can wear them.

The down­side is that wick­er mod­els have met­al fas­ten­ers strong­ly pro­trude from the grooves. It’s a mat­ter of a dif­fer­ent body shape. On my old steel ones, this is not so notice­able, but on some black alu­minum ones it will be vis­i­ble from afar.

More suc­cess­ful­ly, an ordi­nary mono-bracelet will fit on the old AW, but when pulled, it does not lock “to zero” in the grooves, there are voids.

I tried to pull off both bracelets. Specif­i­cal­ly, in terms of reli­a­bil­i­ty, there is no dif­fer­ence with, say, Series 6. There are just small visu­al dis­ad­van­tages that I men­tioned above.

So there is still com­pat­i­bil­i­ty, they just won’t look as good as Apple intend­ed. And Apple is expect­ed to pay max­i­mum atten­tion to this. Here is the warn­ing.

But if you real­ly real­ly want a mono bracelet, then you can take it with your Series 3 or old­er. I don’t see any crit­i­cal issues.