This liner is made by SIA J.E. de Le Mans in 1962. This company still excists see: http://www.sia-industrie.fr/r
The R within the stamp tells us this liner is made of Rilsan.
Rilsan is the trading name for Nylon 11/Polyamide 11 which is a polyamide and bioplastic member of the nylon family of polymers. For more information see https://www.engineeringclicks.com/rilsan/.
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