This could be a complete misdirection however there is information here on Pressglas Korrespondenz regarding Russian examples of Launay Hautin glass:
https://pressglas-korrespondenz.de/archiv/pdf/pk-2008-2w-00.pdfThese have different markings on the base to that on yours. However I was just wondering if perhaps yours might not be H & V but perhaps Cyrillic? I couldn't see the mark on yours very well though so this suggestion could be way off course.(Edit - I've looked again and got my straight eyes on and I can see the mark now so my comments are possibly not relevant - it does look like H&V to me but that doesn't ring any bells. Apologies)
That said, your pattern looks very similar to that in the Launay Hautin catalogue. Perhaps it was later produced piece not in those catalogues? or an earlier piece? For example I have a piece not in the catalogues (1840 or 1841) however it is thought to be an 1830s piece from probably Saint Louis.