Browning.com has a sn look up function under customer service.
1956
I have serial number 26267 X6 and it was bought for me when I turned 11 in 1970.
Impossible to answer without the serial number and a detailed description of all markings, features and type of action.
Your Browning auto rifle in 22LR was made between 1956 and mid 1961.
Browning's web site has a sn search function.
You will have to call Browning to find out.
You MUST call Browning.
100-1000 USD or so depending on specifics
Impossible to answer without the model, type of action and serial number.
No serial number given.
1966
You will have to call Colt since you did not provide the serial number.