You could do worse that this
http://www.ebay.co.uk/itm/STEM-CROWN-for-SEIKO-DIVER-4205-Auto-NEW-/132255958439?epid=1433662390&hash=item1ecb11c5a7:m:mM__7eOVB3B_Bbq5bY1fSgg
I think all 4205 cases have the same crowns
@Stonehedge started
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You could do worse that this
http://www.ebay.co.uk/itm/STEM-CROWN-for-SEIKO-DIVER-4205-Auto-NEW-/132255958439?epid=1433662390&hash=item1ecb11c5a7:m:mM__7eOVB3B_Bbq5bY1fSgg
I think all 4205 cases have the same crowns