the hallmarks show a lions head in a shield shape and a U in a sort of square but if you look at the London hallmarks from 1923 the lions head changed to a square and the U for 1935 had two tails at the bottom instead of one.
see page 12 of
https://webarchive.nationalarchives...ingcouncil.gov.uk/publications/hallmarks2.pdf
as for your pipe .I tried enlarging the picture but cant see clearly.It looks like an i for the year and the lions head seems to be in a square if so yes 1924 appears correct.You should be able to confirm it from the link I posted above
Thanks for the info!