Thanks John. I was thinking around mid 70s ish, they are certainly a lump these large weights.
The place I picked this one up from, had another large weight for sale when I visited a year or so ago. I had a feeling that one may have been pre 72, although sadly had damage so I decided to leave it. This ones in good condition, but did cost a bit more than most other Mdina weights I have seen, but at 2kg also weighs a bit more than most. Certainly, not one to drop on your foot!