Old Guinness bottle 1922-1937

21 cm's tall - Brown - Found in a Hedge row outside the Town of Lismore, County Waterford, Ireland. - Embossing on neck says PT for pint?. - Embossing in Stamp on Shoulder says DIC ? then S E (which I take to stand for Saor Stait Eireann or Irish Free state which would have been in existence from 1922 to 1937), and the numbers 127 beneath.
On the base is embossed I G B, which I take to mean Irish Glass bottle, then S 120 - 6 and finally LVII