basically just remove the bolt then insert a small oil patch down the barrel with a rifle leaning rod.
use the same oiled patch to wipe the metal on the rest of the rifle.
Ask a gunsmith for help if you don't know how.
None of the 03A3's are antigues
depending on condition a Smith Corona 1903-A3 should bring from $700 to $850
Could be anywhere from $300 to upwards of $1500, depending on condition, whether or not the parts match, etc.
The value of a collectible military rifle will be driven- in a large part- by the condition. $700 to $1000 for a good specimen that is still in the military configuration (not "sporterized")
What is value of a US Remington Model 03-A3?
Yes.
1 trillion
$300-$600 range
What is the value of a 03 a3
You will have to get it appraised to find out.
September 1943.