Hi Zippi,
looking for an easy detachable sticker to verify a fake Strida seems a bit naive, don’t you think so?
There is actually such a sticker at each Strida, it is usually attached at the seat tube, close to the upper ball joint.
I’d look at the bottom tube’s underside, close to the rear hinge - here should be the frame number, which fakes normally do not have.
There are also several other signs of a fake; strange brake calipers for example, rippled frame tubes and even parts without function.
We are calling these bikes SLO’s - Strida like objects - and you can find much more info by using the forum search with that terms.
Keep Strida Original - say NO to Fakes!
Perhaps you could upload pics of that specific bike, or do you have links to the offer?
Best regards,
Chris