Oval block with central hole, possibly natural rubber, no provenance, 1830-1880 Oval block with central hole 1830-1880
Specimen of silicone rubber stereo for experimental printing, cast from the vulcanised fibre matrix. Specimens of silicone rubber stereo and vulcanised fibre matrix 1959
Pressed block of rubber from India, 1830-1920 Pressed block of rubber from India, 1830-1920 1830-1920
Ball of rubber(?) split almost in two, provenance unknown, 1830-1920 Ball of rubber(?) split almost in two, provenance 1830-1920