The few examples I've seen (mostly online) are similar in architecture, but there seems to be a decent variety in furniture which is to be expected given the long time span. There are some guns marked as made by them jointly and at least one or two guns attributed in the past to the father that were clearly made by the son given they are signed "J.M. Shillito." Our page in the gunmaker library states that they believe the son stamped his name, but one of the few examples I've seen in person was signed "J.M. Shillito" by hand. Perhaps later in his career he switched to using a stamp?