▁ 1 8 3 9 , ▁on ▁the ▁north ▁side ▁of ▁the ▁burn . ▁It ▁was ▁named ▁in ▁honour ▁of ▁the ▁Ast ley ▁family ▁of ▁Mel ton ▁Const able ▁in ▁Nor folk , ▁who ▁inherited ▁the ▁Del aval ▁est ates ▁in ▁ 1 8 1 4 . ▁▁ ▁The ▁Del aval ▁Ar ms ▁– ▁situated ▁at ▁the ▁south ▁end ▁of ▁Hart ley . ▁ ▁The ▁Ast ley ▁Ar ms ▁– ▁situated ▁at ▁the ▁north ▁end ▁of ▁Se aton ▁S lu ice . ▁ ▁There ▁is ▁also ▁Se aton ▁S lu ice ▁Working ▁Men ' s ▁Club ▁near ▁the ▁Water ford ▁Ar ms . ▁ ▁The ▁Oct agon , ▁is ▁a ▁small ▁cast ell ated ▁building ▁to ▁the ▁east ▁of ▁the ▁Water ford ▁Ar ms . ▁It ▁was ▁built ▁som etime ▁before ▁ 1 7 5 0 ▁as ▁the ▁Har bour ▁Office . ▁It ▁is ▁claimed ▁that ▁it ▁was ▁designed ▁by ▁Sir ▁John ▁Van b rug h . ▁ ▁It ▁is ▁now ▁a ▁private ▁art ▁gallery . ▁ ▁Se aton ▁Del aval ▁Hall , ▁built ▁by ▁Sir ▁John ▁Van b rug h ▁between ▁ 1 7 1 8 ▁and ▁ 1 7 2 9 , ▁for ▁Admir al ▁George ▁Del aval , ▁is ▁on ▁the ▁out sk ir ts ▁of ▁Se aton ▁S lu ice , ▁on ▁the ▁road ▁to ▁Se aton ▁Del aval . ▁The ▁hall , ▁which ▁is ▁a ▁Gra de ▁ 1 ▁listed ▁building , ▁is ▁now ▁owned ▁by ▁the ▁National ▁Trust ▁and ▁is ▁open ▁to ▁visitors ▁on ▁designated ▁days .