He recorded marks with Aaron, his brother from 1767 and alone from 1771. Grimwade lists this particular mark, 3892, as unknown, but Lesturgeon does seem to be the only likely candidate at that time, and is known to have marks in the 'lost' ledger. Grimwade suggests that the address "Mr Douxsaint's Toy Warehouse, 49 High Holborn" is a mis-written name in the original 1777 ledger, however such a warehouse did exist at that address and Aaron's wife was Catherine Douxsaint.
Makers mark with pellet
These tiny tongs weigh just 1/2 ounce and are only 3 1/2 inches long, but in the same proportions as a normal sized pair. The address listed for the Lesturgeons is a "toy warehouse" and perhaps this accounts for the very small proportions? Were they made for a privileged little girl's tea set? If so they were not played with as they are in immaculate condition!! of course they could also have been a pattern sample or an apprentice piece in much the same way as the miniature chests of the same period. They are definitely Georgian, the sterling lion is facing forwards, there is no duty mark and no date letter suggesting pre 1784.
Georgian Sterling Mark