@maxbernat. The logos/stamps (embossed or otherwise) have been discussed many times on the Forum over the years
I recall a member , who used to post here, aptly named "Eameshead" and by entering their user name into the search function, managed to narrow down the results !
I'm sure someone else here can help with the ink stamps.
From a post in 2013.
"Circle "S" w "Herman Miller" embossed = later Summit* c. 1960s to at least mid 1970s (many of these also have paper label and HM medallion)"
Link to thread. post 2, page 1:-
* Summit was one of the companies to whom HM outsourced the manufacturing of these chairs as far as I gather/remember. 🤔
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