I don't think (note the think) that this shape of paperweight is from the Michael Harris era, although the Boffos came from WF. Keith's are deffo Mdina colourways, Earthtones and Tiger, although the standard blue with silver chloride (yellow cloudy) seem to be more common for this shape. I'll poke Sue (Chopin Liszt) and get her to have a look.
NB: Last Saturday, I picked up what I thought was a very modern Mdina fish in the classic blue and yellow, only to find a Phoenician label underneath