Both 1973 - 1979 no later
There is a good pic of both your labels on one piece in the book 'J Miller guide 2004 pp274'
The yellow and white weight is when they were experimenting with colour; everyone associates them with iridized glass called ‘Azurene’ which came in the 1980s and is perversely more collectable
Tiger gives a good attribution from a book, I can see yours also has a rim around the base and it is indeed called a 'Seaward' pedestal paperweight - I take it yours is not signed by Harris (?) - the paperweight should have a pontil on the base with an impressed 'flame' mark called the 'gather of glass flame' mark - if not don't worry its still IOW
Here is a weight from same period in orange with bubbles and a single twist of silver foil in the middle - it is almost non-sellable at the moment, your one having the paper label and attribution would make it more desirable
I love the oblong weight / block, it’s an 'Aurene' block or sculptural piece c1975 - 76 - those browns and whites with ....I think a slight opalescence or iridescence in the inner decoration?
Here is an Aurene Vase of same period - notice the label (they used two types one with and one without 'England') - Your Aurene block is the more desirable and a IOW collector would pay over £40+ for this, there is no proof I can see that they were candle holders, I have had some without holes, the surface is always rough though
The round yellow paperweight would not have had the 'Hand Made Isle of Wight England' label on it; this was for sculptural items and vases
The block would probably have had the paper 'flame' logo label as well as the existing label as it did not have a pressed pontil mark - but it does not detract
BTW - yes there are / were other glass makers on the island
Lucas - Touch of Glass (now closed)
Any I forgot?