It's a very good , broad introduction to the subject which also includes some Irish glass and some examples of miniature decanters . First published in 1972 however !
There is quite an interesting Irish straight sided decanter illustrated on page 50 (looks like a Prussian shape but it doesn't taper towards the base , just straight) and the description is as follows......
'An Irish quart sized decanter of straight-sided shape with a central band of diamond cutting, broad flutes on the shoulder, narrow flutes below (same as yours Bat near the base) double cut slice cut neck, diamond cut mushroom stopper.Height 10.5 inches date c1810.'
He then goes on to say.......' After 1810 the vogue for more cutting on glass became marked , and a decade followed when diamond cutting and broad and narrow flute cutting on decanters and drinking glasses became very popular' and ...............' The earlier sharp diamond cutting gave way after 1810 to a softer variation known as strawberry and rosette diamond cutting '
I'm not sure which category of diamond cutting yours comes under Nick !?
Hope this can help, Cheers, MIke