Thank you for the GMB link,m.
I see that Paul S. has already mentioned the troughs in the 1888 Edward Moore catalogue
The 1888 Edward Moore catalogue in Hajdamach BG 1800-1914 shows a ‘bridge’ posy #738 with distinct feet (presumably designed to stand upright) like your example, and a similar trough (#978) without feet lying on its ‘side’. The clarity of the illustrations is not particularly good so it is difficult to see the details of the decoration, but the sides of the troughs seem to be devoid of ribbing (whereas other troughs shown are definitely ribbed).
Looking at the Edward Moore catalogue in more detail reveals that the curved trough #974 has no feet, but the vertical ribbing seems to be grouped as 3 (or possibly 4) narrow ribs alternating with a single wider rib. The rectangular trough #970 has alternating groups of vertical ribs like #974, whereas rectangular trough #9976 has feet, flattened sides, and evenly-spaced vertical ribs. So, although there are similarities between the troughs in the Edward Moore 1888 catalogue , ‘my’ rectangular and curved troughs, and your bridge trough, these disparities make me doubtful that they from that source.
The Molineaux Webb RD 70422 heart-shaped flower trough certainly has the correct type of reeded decoration to the base and sides and beaded decoration to the top edge, but I have never seen marked examples in any other shape. Possiblility of a MW unregistered version?
The attribution of curved troughs similar to ‘mine’ as possibly an 1881 Sowerby –patented design at
http://www.museum.bristolblueglass.com/flower-troughs-ca-1890-possibly-sowerby/#.UnIpnlNbOxkhas, so far, failed to reveal any hard evidence for the supposition, but I will continue to look for it.
The Meisenthal 1907 examples at
http://www.glas-musterbuch.de/Meisenthal-1907.124+B6YmFja1BJRD0xMjQmcHJvZHVjdElEPTU1NjgmcGlkX3Byb2R1Y3Q9MTI0JmRldGFpbD0_.0.htmlare certainly strong candidates for ‘my’ troughs. The rectangular trough #2500/1 is a very good match, as is the curved trough #2503.
Interestingly, Meisenthal 1907 #2505 is a ‘bridge’ trough lying on its side (like the Edward Moore #978), without feet and with obvious vertically-ribbed sides and a beaded top. Also, the Meisenthal troughs include a small swan trough # 2515 (and Moore had a swan trough #960), a triangular trough #2509 (and Moore shows very similar triangular troughs #985 and #971). I wonder if the Meisenthal glassworks acquired some of the Moore moulds after the factory closed (though Hajdamach says that they were acquired by Davidson)?
So – possibly Meisenthal / Edward Moore / Molineaux Webb / Sowerby / Davidson – any more for the Skyark?!!
Fred.