there's always going to be a limit to the amount of info that can be wrung out of some pieces - much glass defies a precise provenance/attribution or d.o.b. - either because of lack of defining features, or verifiable age. I think you've summed up its obvious worth when mentioning colour and utility value - and looked after it should offer years of service - provided, of course, that you like flowers

I'd hazard a guess that you would have bought this cheaper at a boot sale, but paid more at an antiques fair (bristol blue attracts a higher price, often), and words like cheap or expensive are meaningless on their own - every comment we make is relative, as you suggest, so it's best to qualify comments and avoid doubt.
If your reason for buying was solely to put another notch on your learning curve, then I don't know that you are going to get a fiver's worth - I sense this to be of practical value only, and very much to remain a nony mouse.
As to learning more about the piece............hold it up to the light, does the blue change in any way - I seem to remember reading that C19 blues show a purple ish look under transmitted light - but not sure where I read that.
Can you feel the mould pattern both inside and outside of the vase?
You don't mention the top rim - fire polished or ground flat - if the latter then possibly Continental.
I'd suggest that the kick in the base (the indent) is an economical solution to removing the pontil scar - i.e. no need to grind/polish/remove the scar - you just push the base in while still plastic.
Vases probably gain more wear than a lot of items - continually being moved etc., so may not be as old as first thought.
At the end of the day this is just another blue vase, and if pushed I'd suggest possibly Continental and perhaps first third C20.
Just possible to add that.......... a lot of late C19, inexpensive, glass - particularly in dark blue and green - was decorated with those enameled dots and rustic floral scenes - and the absence of this feature might indicate this to be C20 rather than earlier.