Sandblasting is the most widely used method of marking since the 1970's. Health and safety as well as cost come into play. It is usually done with a stencil. It is easy to recognise with a glass as there are small pits as opposed to acid etched which is smoother.
Here is some glassware engraved in 1985 by sandblasting LINK
all of Burns Crystal
etched designs are sand blasted.
Sandblasting on glass was a US invention, see transfer printing forum - Sand-blasting 1870. (USA - Benjamin Chew Tilghman)
It is slowly being replaced by inkjet printing which is extremely fast and allows extremely fine detail as well as full colour and chemical bonding to the glass by UV exposure. A lot cheaper too.