Early Thonet Bentwood Wicker Rocker

I just got this bentwwod rocker at a yard sale. I noticed the label on the underside and verified it as a Thonet by Schaukel-Fauteuil. I know that by 1860 Thonet was producing bentwood rocking chairs with woven cane seats and backs, but they were made well in to the mid century.
It looks as though this one has a very early label, but would love more information on how to determine the age. Any help would be greatly appreciate any help you may share...