Man pages matching name visir_old_spc_obs in section 7:

visir_old_spc_obs.7.en	debian 10 / cpl-plugin-visir-doc
visir_old_spc_obs.7.en	debian 11 / cpl-plugin-visir-doc
visir_old_spc_obs.7.en	debian 12 / cpl-plugin-visir-doc