Welcome to the forum.
In 1892 there are 4 different overprints currently known
“Cartwright” “Copper Cliff” “King St. West Br” “ London”
The Charlton Catalogue currently lists the following;
22-26a, $10, 1892, LONDON o/p, G $1,125 – VG $2,250 – F 3,000 – VF $4,500
22-26b, $10, 1892, other town o/p, G $1,250 – VG $2,500 – F 3,250
Sound like you have an interesting note. If you have a scan of the note, I would very much like to see it.