Hi Bernard
At first glance; yes, your jug does look 1st 1/2 19th C; but to me, it doesn't quite add up. As you have mentioned; the strap handle, even though it was generally superceded by the stronger dab handle in the 1860's continued to be produced, so can't be relied upon as a definitive dating feature. The way the handle is formed and the style and general 'feel' of the cutting doesn't quite ring true with me as early 19th C; and the item as a whole has the look of a later pruduced piece. Cut glass other than Irish Georgian isn't really a strong suite for me; but I feel your jug may well date to the 1920's/30's when a lot of 'Georgian revival' glass was produced.
Trev.