100ml conical (Erlenmeyer) flask with ground glass neck

glass flask, 100ml pyrex conical (Erlenmeyer) flask with ground glass neck (joint size B19), made by Laboratory Glassware Manufacturers Ltd., Beckenham, Kent, England, date unknown. The object has the trade mark 'PYREX' printed in white above the words 'MADE IN ENGLAND' and a square white marking spot and has 'approximate volumes' '50' '75' and '100' also marked in white on the body of the flask. The object has the manufacturers trade mark 'LGM' and 'B19' stamped in blue on the neck of the flask.