Picked up this little pair of Roemers today in the charity shop, they measure approx 8.5cm in height, 5cm across the base and 3.5cm across the rim. I have never bought any glasses like these before and assume that they are continental, possibly German? Anyway I don't know how to date them, they appear to have some age with slightly irregular bowl and stem shapes between the two, small inclusions in the glass particularly when viewed through a loupe and wear to the rim of the base. The inside of the bottom portion of the glass seems to have accumulated vast amounts of dust and grime which is reflecting much of the flash in the photos. My default guess for glasses is 2nd half of the 19th century.
Looking forward to your comments.