The Queens Yacht at anchor (it is affixed to a buoy which means that it is moored not anchored)
with what looks like its twin in the background. As Queenstown was the name given to Cobh in Co. Cork and this looks nothing like Cobh it is safe to say that this is not Queenstown! This lovely, crisp Royal plate from the Lawrence collection shows the detail of the ship to perfection. What seems surprising is the number of small boats in close proximity, herself was not that fond of mixing with the peasants?
With confirmation that this is not Queenstown, and as derangedlemur
notes, is actually/ironically Kingstown, we have mapped this image to the harbor at Dún Laoghaire. In terms of date, given that this "version" of the royal yacht was superseded by a newer vessel in 1901, it seems plausible that this image dates to a royal visit in 1900....
Photographer: Robert French
Collection: Lawrence Photograph Collection
Date: Catalogue range c.1865-1914. Very likely c.1900 (Royal visit)
NLI Ref: L_ROY_06471
You can also view this image, and many thousands of others, on the NLI’s catalogue at catalogue.nli.ie
Owner: National Library of Ireland on The Commons
Source: Flickr Commons