I just replied to your query about this decanter on the Whitefriars forum.
The decanter is a Holmegaard klukflaske, or kuttrolf. The colour of the glass suggests that production was 1970s/90s. If the pontil mark has been left rough, then quite possibly it was a production second, with the flaw not being spotted until that stage.
The other glass is a candlestick holder, and was made by neither Holmegaard nor Whitefriars.