I'm starting a thread for this because it's something I've been wondering for a good few years now.
I don't own a piece yet though.
I see these tall stoppered bottles, in cut coloured glass, fairly often and they are always listed as Bohemian.
Often they are enamelled and this pair that sold through Christie's have a particular type of enamelling that I see on other glass pieces. Those pieces are opaque opaline, in shapes (ewers and tall thin neck bulbous bottom footed vases) and glass (opaque opaline in an odd blue and an odd green - neither colour I associate with Bohemian glass but could be wrong) that I believe could be from Beykoz glass (Turkish). With a peculiarly bright type of enamel greeny yellow on them in various forms on many of them and usually some flat white in some form of flower heads.
So, are/were these pieces shipped into Iran/Persia and enamelled there?
Or were they all enamelled in Turkey but some pieces made in Turkish glass factories , others bought in from Bohemia and enamelled in the same way, all to be sent to the Persian market?
Or are these stoppered bottles in fact Turkish rather than Bohemian and enamelled in Turkey.
I think the opaque opaline ewers and footed tall vases with bulbous bottoms and narrow tall necks are Turkish, and most I've seen are attributed to Beykoz.
These are the type of stoppered bottle I'm talking about (Christies, sale 6853, 2 Dec 2012, Lot 57)
http://www.christies.com/lotfinder/lot/two-large-enamelled-gut-glass-decanters-bohemian-5602655-details.aspxI'll find some examples of the opaline with the same enamelling and add those in a sec but this pair are a good example of the enamelling being found on the shapes I refer to, although this pair are clear glass. But the shape of the vessel is the same as the opaline ones I'm talking about, bulbous bottom and tall narrow neck with a foot (you should be able to click on the picture and have it enlarge to see the enamelling)
http://www.worthpoint.com/worthopedia/pr-antique-bohemian-ottoman-beykoz-137645269here are some other pieces with similar enamelling sold as Beykoz
http://www.worthpoint.com/worthopedia/pr-antique-bohemian-ottoman-beykoz-137468651http://www.worthpoint.com/worthopedia/ottoman-turkish-beykoz-opaline-glass-142325847http://www.worthpoint.com/worthopedia/ottoman-turkish-beykoz-french-ewer-247568120http://www.worthpoint.com/worthopedia/pr-antique-bohemian-ottoman-beykoz-137468651This is a better example of the colour of the enamels but I'm not sure how old this piece is. The blue of the opaline is a bit brighter than the kind of duck egg blue I'm thinking of although I've also seen this bright odd blue as well.
http://www.ebay.co.uk/itm/OLD-OTTOMAN-TURKISH-BEYKOZ-FRENCH-EWER-OPALINE-GLASS-ENAMEL-OVERLAY-BOTTLE-/251351019390?nma=true&si=l2MBzUYPY0OGjxE48GmpcUBq724%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557m