Hi Mark,
I really would be very wary with this one.....
Lipa's work is usually ignored,and almost always attributed to Hlava, and rarely well-documented.......
Were it a Lipa piece, then I would expect either a Moser mark, given that he designed in-house for them, or an Exbor Studio's mark to the base.
Lipa was not known to have been involved in the re-training programme for Mstisov workers, when they were moved to Karlovy Vary.
This programme led, as I am sure Mark will know, to many items, to designs by Zemek, being made by Moser, usually with paper labels, rather than acid etched marks.
Regards,
Marcus