Yes its a Humber,and not a,, lifeguard ,,or Arancia i had one in the 1980s 16 foot long workboat version with a jocky seat ,Great boat though with big size tubes ,,,
good mariner 40s usually make about £500, trailer maybe £150, boat £300 ish, plus the other bits, seems about right at £900 may make a bit more maybe a bit less