Help Identifying Pottery Vase Candleholder Marks

I purchased this pair of vases or maybe candleholders. I do not recognize the marking. The included one looks like BO or BU. There are a couple more markings in blue. These are probably over a foot tall and are covered in nicotine. I will be cleaning them soon. The colors kind of look like majolica but I am pretty clueless on the maker. Thanks for any help.

Looks to me like late 19thC German/Austrian Porcelain. Maybe the Sitzendorf factory or one of it’s competitors