Thanks Worzel; I will do that. In reviewing the discussion forum on the fast tech website, one poster linked to a December 7th, 2013 review of the VTR in which the difference in versions is discussed (at around the 5:00 minute mark):
Innokin itaste VTR (redesigned version) - YouTube
The video reviewer also points out that the redesigned 510 connection - that is fixed (that is, not spinning) - has four air grooves and two air holes in the base of the connection that are apparently not present in the original. You can see it in the video. That should be a good way to discern the older version from the newer version.
From the discussion forum, it would appear that the redesigned version was released in early December:
What version is being sold?: FastTech Forums
Check it out!