That attenuated bottle isn't marked, neither is my other, slightly shorter one.
The other bottle, with the flared rim, John shows is marked Mdina, in the early style of script, my other one isn't marked.
They all date to the mid-'70s onwards.
These belong in the period of interesting and complex designs that were created in the period shortly after Harris left and before Said took over completely.
(these are the other ones)