Margaret Martin's suit vs. William Spencer also appears in Ms. Hahn's vol. IV (criminal actions). The transcripts in both volumes provide a lot of information and specific dates that don't appear on bastardy bond forms.
It appears that Margaret Martin had two children by William Spencer ("maintenance of both my children").
The person who pressing the charges against William Spencer in behalf of Margaret Martin is an Isaac Martin.
The reason the action ended up in Superior Court is that Spencer was indicted for a midemeanor; he was accused of forging Margaret's name on a receipt to make it appear that he had paid her child support.