I agree that the crown is worrisome from that perspective, I would think that such iconogtaphy would be a significant factor in the creation of a local coinage. Though the date is fairly early in the Austrian rule, I wonder whether there would still be confusion about the proper crown design. Either it's deliberate, as you say, or the coin is perhaps a fantasy piece/counterfeit. This was not a primary part of a lot purchased some years ago, and beyond that I don't know anything about the coin's history--also potentially worrisome. I note that I haven't seen any of these before or since. If it's a fake, it would be great to find some others, and I've looked--but only casually. I'll have to be more diligent in my search from now on. Thanks.