You're right Nola.River.Rat to be disappointed with these heartbreakers. I found a Guldens like yours several years ago and learned it was a forerunner to Guldens mustard and thought it to be a triangular capers bottle. I sold mine for $100, now I wish I had kept it
I agree with both CanadianBottles and WesternPA...without the label, I would think it was late 1800's, and maybe there were hundreds or more, stockpiled at the distillery that had to be used up, maybe it was a bottle being re-used. Either way, it is a nice looking, clean, crisp strap sided flask...
Bees... I would assume that if someone is maintaining his website, then there are probably some books to buy. When the website goes down, then you would have to keep an eye on eBay, face book or in second hand stores. Give the website a try and then get back to us