Not a scratch !,what are you looking at ?…I read somewhere some were made at the end of work and left through the back gate !?
I too was looking for a mark on the base and saw it as a scratch so thanks for clarifying what you meant.
I don't know about the comments on end of day leaving by the back door. These paperweights are called scrambles as far as I know and contain lots of lovely canes and are production items from various factories.
Likewise 19th century and early 20th century vases from Bohemia and France which have many coloured splotches on them are also production items specifically made in those colourways and shapes by the various factories. Clichy, Ruckal, Welz, Kralik etc spring to mind. In the 'olden days' I saw these referred to as 'end of day' items here in the UK. Now it is known they were by specific makers and the shapes can be assigned.
You mentioned a deeply polished pontil. I can't see a polished pontil mark on the pictures. Is it a completely polished base slightly concave with a flat base ring around it?
The bluey green of the canes which contain green is interesting and pretty. I don't see that bluey green very often (caveat - my knowledge is seriously limited on paperweights). Often the green I see is brighter, more grass green.