Doug. Do you know the diameter and tap size?
Not sure whether this might help in a pinch (I know it's overkill): I've seen this one for sale for some time and your post triggered my memory.
http://watchsteez.com/BulovaWristAlarm1958.htm
Part Number for Alarm Crown is Bulova 706.
Part Number for Winding Crown is Bulova 306 (Water Resist is 313S).