Hi Hoody and Sissydear,
Many thanks for your replies.
The probable reason that Germany was favoured by those few who replied to my request, is likley to be down to the fact that the antique dealer was from Bad Lobenstein, in Germany.
The dealer described the marbles as 'old' and 'original'. In an e-mail he told me that they had come from the German equivalent of an estate sale. Also, that they were 'found between floorboards' (always the sort of comment which makes me doubtful).
Both marbles do have pontils.
The latticino marble is 35mm diameter, and appears to have 1 melted pontil and 1 ground pontil. Both are small. The marble is reasonably spherical, but has one obviously flattened area (which does not coincide with either pontil).
Pictures showung pontils are below:
This second marble is 33mm diameter. It has 1 ground pontil, which has not quite flattened the raised point at which it was cut from the cane. I cannot see a pontil at the other end, though I can feel a slight irregularity to the touch.
Both marbles are a lot less perfect than any contemporary American Marbles which I have, and I cannot see ant signature, using a 10x loupe. My eyes aren't great, I'll ask my wife or daughters to get a second opinion.
All and any opinions valued.
Steve