'john reynolds alias mason gentleman, one of the bailiff and peers of this town and liberty' I think would be a fair version.
He was a gentleman therefore it must be his alternative surname rather than an occupational Mason I would think. He must have held an official office within the town and probably was a pivotal part of the Manoral Court system in that particular wapentake/hundred or even a larger area where abouts was he buried?
As he was a bailiff maybe a JP and probably very prominent in the local manor court it is likely you will find plenty of entries in the quarter sessions or manorial records for the borough/wapentake, they will be indexed in the Shropshire CRO