hello Roy - I'd suggest these are sherry glasses and in my opinion date c. 1860 - 1890, perhaps a tad later possibly. I don't remember now whether you have a copy of Silber & Fleming, but if so you will find in that book similar pieces with this sort of cut decoration, which I'd also suggest is more correctly termed cut hollows rather than slice cut. This rather basic cutting was performed on a medium sized convex edge wheel, and the feature is sometimes called oval punties or, when larger, cut mirrors. Very common form of decoration and seen on lots of glass from the C19, either on their own or, on early C19 glass used in horizontal bands with alternate bisecting mitres - thus producing the famous OXO decoration. Sometimes you find them under feet.
Probably as equally a common a decorative motif as those small four cross-cut stars that are seen on second half Victorian, and later, drinking glasses.
Originally, S. & F. catalogues date to something like the early to mid 1880's.
One feature worth mentioning, and said to be a dating guide for those green/cranberry/blue, same sized drinking glasses (for the blonde wines apparently) - is that....... glasses made c. 1860 - 1880 are more likely to have a collar under the bowl - those without a collar are likely to be a little later. I'm sure you know the coloured glasses I'm speaking of - the green variety are the most common colour, and you see them often.
Whether this dating guide holds true for items of clear glass I'm not sure, but it's worth considering. I'd also think that you'll always find a polished pontil depression on the feet of these glasses, very unlikely to find a snapped scar.
If you don't have S. & F., it really is worth buying - and unlike my unfortunate and misleading comment the other day regarding Bickerton, S. & F. is affordable - there are a couple of U.K. copies on Abe books just now for under £20.