Hi and welcome to the board MPB911, I hope you find it interesting and informative, and look forward to sharing your glass queries and comments.
As I understand it, a pontil mark only relates to an item which has been attached to a pontil rod, which is used when an item is free blown or mould blown. For a piece like this, which appears to be press-moulded there is no pontil mark. We have an interesting topic here:
http://www.glassmessages.com/index.php/topic,945.0.html which has contributions from both a retired pressed-glass maker and a working blown-glassmaker, which you might find of interest.
It's not technically correct to say that a bird bath base indicates Czech manufacture, as such bases are found on glass made outside Czechoslovakia / Czech Republic, and I tend to agree with Paul that this doesn't appear deep enough to be a bird bath base though it's not easy to tell from the photo.
John, Germany might be a possible, have you browsed Pamela's museum site?
http://www.pressglas-pavillon.de/index2.html