Hi ,
" If these bottles were known with this kind of fancy ormolu cyphered stopper having a tooled lip and a pontiled base I would be more skeptical about this one and the one in AU."
this is an extract from the Glass in the Rijksmuseum Catalogue page 189, description is attached to what in essence is an identical bottle/decanter as yours with mount and stopper , not like yours though , the pontil mark is clearly visible through the glass which is brightly lit
A quarter of the bottles had a silveren beslach (silver mount),several others have a messink vergulde beslage (gilt bronze mount )or a "koperen vergulde dop (gilt copper stopper),
as you can see from the above the 17thc bottle are well known with decorative stoppers along the lines of yours ,
No I did not contact Andy , and i will be interrested to see what he has to say about it,
I am beginning to feel a little like the bad guy in this thread , I hope you will take my comments in the spirit that they are meant , as it is only by questioning anomaly's can you end up with answers , if the result is that I am completely wrong in my observations re pontil mark and ground rim being odd for the period , then I for one will be very pleased both for you and for me , something new to me will be learned .
Cheers ,
Peter.
ps , I am also surprised that no other members of the forum have given any suggestions
pps , I have just re read this ,
"I think if anything they may be a bit later, done some time in the 18th century perhaps."
This is what i have been trying to say all along that it is probably a later copy of a 17thc decanter ,for all the reasons I gave ,and would go so far as say that 19thc is also a possibility ,
so have we now got crossed wires , my comments all along were that it was not 17thc

??
and that the ground top would indicate continental manufacture,not English ??