Apologies in advance for a potentially quite boring post but being something of an obsessive collector of jobling, I was fascinated by Glen's discovery and re-examined some of my pieces as a result. I have previously shared some of my observations regarding the possible differences between Jobling and Sowerby production with Glen, however, having recently joined this message board, i thought it a good time to revisit this topic and add a few more comments that may be of help in distinguishing between the two makers.
http://tinypic.com/k0j24j.jpgThe amber example in the picture, though unmarked is almost certainly Jobling given it's colour, finish and height. The pink vase I believe to be Sowerby as it is generally softer in detail and shorter. What is of note is that both are below 8 inches in height, the pink one is 7 1/2", matching the Sowerby catalogued height while the amber vase measures 7 3/4 inches, 1/4" below the dimension given in the Jobling catalogue. This does not appear unusual as I have a large Jobling example (marked Regn. Applied for) which measures 9 3/4 inches; again 1/4" below catalogue height.
Another difference is in the treatment of the tall central tail feather, the small amber Jobling vase shows virtually no feather detailing, the large vase shows fine hatching (excuse the pun!) towards the base, matching the treatment on the wings and rest of the tail. Because of this, I assume the small vase should have similar detailing but it just hasn't taken well on my example & may have been further obscured by the acid frosting.
The pink vase in comparison shows more pronounced horizontal ribbing extending the full height of the tail, showing this part of the mould to have been reworked at some time.
Examining the foot on the pink vase, it is possible to make out the impression of a small rectangular repair to the mould, where a new piece of metal has been let in where the two parts come together. Obviously I don't know when this was done but it shows the mould was older when this vase was produced.
Finally, there is a general difference in finish with the pink example having been apparently much more heavily melted/ fire polished, further softening the detail. This is particularly noticeable around the birds & foot, perhaps explained by Sowerby's practice of 'Double Melting'?
http://www.glassmessages.com/index.php/topic,579.0.html (thanks Adam for a fascinating post).
I hope I haven't bored anybody too much! :wink:
Steven