Help with Identification and Repair of Adrian Pearsall style chairs  

Recently bought these two chairs for a steal at an antique warehouse sale. Upon further research they appear to be (at least very similar to) Adrian Pearsall 2315 chair. Can anyone please help identify if these are originals? There are two places where a red stamp indicates "Made in Denmark"

Also- after bringing them home one of the straps on the bottom snapped. It appears to be make out of some rubber/vinyl that has become hardened with age. Any ideas on the best way to get these replaced?

Thanks!
<img class="wpforoimg" src=" http://d1t1u890k7d3ys.cloudfront.net/cdn/farfuture/vdedQ0kLrq6BOL2WL5ZHkL-