There were some air-trap pieces that were not given the typical satin finish (via an acid bath). These so-called "glossy" versions are quite uncommonly seen.
So you really got a great bargain on this special piece of Victorian glass! Congratulations! :clap:
By the way, Manley's book "Decorative Victorian Glass" is out of print & hard to find-took me years to locate a copy & then it was very pricey. A better, in-print alternative is "Victorian Decorative Glass-British Designs" by Mervyn Gulliver, published in 2002 by Schiffer Books. Still pricey but easier to find!