Nice, find looks original,some of these are being faked now pretty good. ABN Forum member Ajohn has a good collection of old Biblical glass. As for the first blown vessels Just a little earlier Leonard. In the mid-first century B.C., the technique of glassblowing was invented in the Assyrian-Palestinian region both free-blown and mold-blown vessels were subsequently produced. There has been quite a bit of Roman glass found around east London including this http://www.sciencedaily.com/releases/2009/04/090430092235.htm This page took a long time to load but well worth it.
http://www.wired.co.uk/news/archive/2012-08/10/italian-shipwreck These jars are slightly older then the Crowleytown Masons[8D]
Here you go this loads much quicker http://youtube.googleapis.com/v/5W053M1x_A0?fs=1&hl=en_GB ....For all of you divers on the site here.....How would you had liked to discover this!!!