Seems like there were a fair number of Probins out there. John Probin likely the grandson of Birmingham John Probin was listed in London from 1826 Lisle Street , Leicester Square from 1830 to 1834 at nr 46 , and at nr29 from 1834 to 1838 . Moved to 70 the Strand in 1844 to 1846 he was at Agar Street West Strand. And finally at Martins Lane from 1847 to 1851 , predominatly made in the later years back action locked sporting guns made up from old stock, a lot of Probins , have early type flint guards & triggers , also used old flint barrels re-breached for percussion , and then mainly of scelp damascus instead of fine twist.

Also listed is James Probin of Birmingham in the 1849 directory.

There were several other Probins listed as barrel makers, gunmakers etc. Mostly around Birmingham but the choice ranges thru John (barrelmaker), Joseph (barrelmaker), Moses (barrelmaker & gunmaker),Samuel (barrelmaker) and finally William, also barrel maker. There are a few others but they predate percussion guns like the first John which was clearly flintlock era maker.