British Trade Dollar Year 1902 - One unique Retooled Date is extremely rare

British trade dollar year 1902 has 3 varieties
It is produced in India Bombay mint with a B mint mark and Calcutta Mint with a C mint mark.

The recorded mintage are 30,404,499 for 1902 B and 1,266,618 for 1902C.
The 30 million plus 1902 B makes this one of the commonest BTD in the market

However 1902C is a rare variety.
The C mint mark is only present for 3 years namely 1900C,1901C and 1902C

The third variety is essentially a retooled die.
It is graded by NGC as 1902/2B
This variety if found is rare and beginner collectors usually not aware of its existence

Variety 1: British Trade Dollar 1902 B
This is the commonest variety

The usual 1902 B.
Purposely selected some irregularly toned coin for display.
This is due to mishandling. Most likely captured vapour in coin flip.
This stresses the importance of proper handling and care for coins

The reverse

Variety 2: British Trade Dollar 1902 C
This is rare variant
This coin is high grade coins which showed the C mint mark clearly.

The flat prong area and C mint mark.
This is high valued coin at its high grade.

Variety 3: British Trade Dollar 1902 /2 B 
This is a retooled die.
Looking closer at the date section, you will see the "2" has been repaired and the old shadows of 2 is hidden next to the printed digit on the die.

This is a retooled die. Very rare variants.
the 1902 is practically double shadowed.
However NGC grade this coin as 1902/2 in the census