Oude= old, Genever=gin; a particular style of Dutch gin; so possibly at some time in the last century a Dutch or Flemish company marketed their product in an "antiqued" bottle; not a fraud, just a marketing ploy.
I still have a ceramic bottle I dug up intact from my garden - how long it had been there, I do not know, but most of the coins that came up were pre-decimalisation. I know it came from the continent, but I've never been able to identify the incised marks. You don't even have the paper label to help you, so you will have to hope that someone recognises the shape!!!