I have a vase that is typical hand-painted flowery Gouda-style. It has quite a bit of crazing and the bottom is signed IVORA HOLLAND 105 Delft and something that looks like OBO or 180. Also has an etched 105 on the base.

I would think this would be Ivor a gouda, although there is nothing to say Gouda on it. Is this common?

PIctures:
https://drive.google.com/open?id=17Hc2nzL86LlV5U0gS1ue71YQKK82sINF
https://drive.google.com/file/d/1iEsIQekE5ypvR5ffPN397hSFRvLR1yHa/view?usp=sharing
https://drive.google.com/open?id=1y-81CB-NUM0Jt0rCLOnztxFx_dlTt2u5
https://drive.google.com/open?id=1-Uju6wxlDWhabvJiNDeqfFrvv2xWDPQv