A Colt challenger with that serial number was made in 1952.
You must call Colt with the serial number to find out.
It was made in 1951.
It was made in 1953.
Proofhouse.com has sn tables.
That Colt challenger was made in 1952.
about 1953
about 1953
1952
Your Browning challenger with the suffix of U6 to the serial number indicates that it was made in the year 1966.The Browning Challenger was available from 1959-1974.
colt fronter six shooter serial # 1186654
A Colt 1903 hammerless .32 with that serial number was made in 1919.