Made 1971. What it's worth depends on finish, barrel length, grips, engraving, if any; box, papers, accessories. Range from 250-700
Feb.1984 with the serial number that you have provided.
Browning did not make the Model 70, Winchester did. Also, the serial number is not a valid Browning serial number for a 7mm Magnum rifle. Please doublecheck your information.
The 357 magnum model 27 was produced in 1935 and ceased in 1994 That serial number dates to late 1953 early 1954 time frame.
There is no way to tell the exact model from just the serial number and published data. Call S&W and they can tell you.
The serial number is K261818 and dates to @ 1955. You will need to call S&W to find out the model.
If you have a model 70 winchester rifle?then it was made in 1964 with the serial number you provided.
1965
@1984
Requires professional appraisal
A magnum model made in 1955
your winchester model 70 was made by winchester in 1972.
If it is a blued 357 with adjustable sights, it is probably a Model 15.