Thanks Dean for posting the pictures.
Keys of this type are hard to date given the lack of technical features, it is however possible to make some general observations.
1 - Security prior to 1787 relied on complex warding, and after that date the 1st security locks had ‘Barrons Patent’ multiple levers. These have neither the quality of the warding to be prior to 1787 or Barrons levers.
2 - So we are probably looking at standard, low security locks made after Barrons patent, but not before the patent expired and was widely copied, also the turning on the two smaller keys is quite fine so I would estimate a date of early in the 1800’s
Hope that makes sense and helps.
