We would expect a card with the simple hand stamped central logo above to came from the early to mid 1860s. However, it must be in or later than the first year at this address. The second card back above looks more typical of the later 1870s.
The elegant if unstable looking young lady below probably had her picture taken later than those above, but this is not certain. It looks as if the arm rest, in spite of being built up, is still just too low. The card has been supplied to the photographer by Frewer & Evans, London. There was a reversion to square cornered cards by some operators in this period.