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Hi. As keith says, you do find dumps in clear glass of varying shades. The colourless / grey ones are less common than the green, and the ones I have seen have been of fairly modest quality and simple design (bubbles, rather than flowers). As for age, dumps were made for close on 150 years and it is difficult to say. The term 'Victorian dump' seems to be used rather loosely, as they were still being made well after Queen Victoria had died. Another point often overlooked is that they were made in Northern Europe (Belgium in particular) as well as in the UK.
Alan