Im sure its not a Apel mount. IMO Rhino.
The trade name 'OPTIMA' was purchased by Target Sports of Halliwell Road, Bolton in the late 90's (?). For a while they continued to import Hakko scopes under the brand name of Optima. These included 2-7 and a 6-24 spec models. (Ive a couple knocking around somewhere and will double check the spec). They were advertised in AGW/Airgunner for a while (dates?).
HTH
Ian