it is this particular body shape that's being referred to when using the word Prussian, and not the country - the word may have some vague connection to Frederick the Great, but a direct attribution to that historic country remains elusive. We supported the guy in the C18 during the Seven Years War, financially, and these things do just about date back to the period.
However, if you look in McConnell, he is very keen to point out that correctly a Prussian bottle should really have neck rings - unless there are acres of prismatic cutting from the top rim to the shoulder, which would make it rather pointless to then apply neck rings.
So, whether we can call this bottle a Prussian I'm not sure.
I'm going to remain mum on a speculative date - dating bottles is fraught with difficulties due to the profusion of non-period copies.