Need to know all the markings before being able to help with an answer.
Model dependent
You need to know the make, grade and model. 270 mag rifle could be anything
Browning Lever Rifle
What about it? You haven't asked a question.
What model of rifle are we talking about?I would need to know along with the age of the rifle to give you a accurate value.
100-425 USD
100-400 or so
Blue book of gun values
Best to ask a gunsmith for help.
Your winchester model 70 rifle was made in 1951.
100-300 USD
100-500 USD