The "IB" maker's mark is a very common mark.  We therefore cannot be at all certain of the attribution of any particular mark to John Blake. However to the best of my belief all of those shown below are John Blake's marks.

Please note that this is by no means certain!!

Click here to see some tongs by John Blake

Click here to see some sugar tongs by Sarah & John William Blake.

Click on any picture to enlarge

1786 - 1790  (notice the flaw in the punch - a tiny vertical "cut" to the right of the "I")

1791  (notice the flaw in the punch - a tiny vertical "cut" to the right of the "I")

1792  (notice the flaw in the punch - a tiny vertical "cut" to the right of the "I")

1794  (notice the journeyman's mark alongside the maker's mark, and the now familiar flaw)

1795  (now a completely different mark - this could well be someone other than John Blake)

1796 

1798 

1799 

1800 

1804  (a "double-struck" maker's mark)

1806  (this mark shows a different journeyman's mark alongside the maker's mark)