I think i may have found some info simply by googlin the name, dates to 1760-1780
and is an engraving rather than etching they seems to be quite a few of these around with different subject matter and prices if your interested roughly 20/30 GBP, but now very curious as to my watercolour this was found in the back of, would the water colour be nearly as old? cant make out the signature any help is appreciated.
Thanks Robert.