I'm not quite sure what you are looking for. What do mean by an "extract"?.
There were no marriage certificates at that time, only entries in the Parish Register. They don't tell you much more than you already know. I have the transcription of it from the Kent Fam Hist Soc, and all it adds is:
The place where it would normally say bachelor or spinster for each party were unreadable, so the transcriptions just has "?"
Both are described as "Tp", or of "this parish" - but that only means they were living there at the time of the marriage. It says nothing definitive about birth place.
Witnesses were Fran Chancey and Maria Samsom.
Nigel