Being a bear of little brain, my tuppenny-worth is:
Nemsova, pattern number 5066, probably originally designed whilst the factory was owned by Karel Schedlbauer. This vase could also be used as a plinth for the matching bowl, pattern number 5065, which had four holes to take the feet of the vase. However, this mould was amongst those transferred to Rosice in 1965.
Regards,
Marcus