In order to help answer your question correctly,I would need more info about the rifle.Please include if your rifle is a lever action,bolt action,or single shot.The barrel length,the maker of your rifle if present,and any special markings other than the patent dates,which you have already posted.
You will need to include the serial number to get the correct year of manufacture.
Look on the receiver and/or barrel
You should contact Savage arms directly,they should identify the year of manufacture for your rifle.
Without a serial number,I can only say that the savage model 340 was made from 1950-1985.If you would include the type of sights,barrel,barrel length,and stock design It would better help me in deciding with in which years your savage model 340 was produced.
Contact Savage Customer Service through their website.
THE LETTER IN THE SERIAL # IS WHAT DETERMANS YEAR OF MANUFACTURE. SAVAGE WILL GIVE YOU A LIST.
To determine the manufacture date of a Savage Model 170 pump with the serial number A451570, you would typically need to consult the manufacturer's records or reference a Savage firearms serial number guide. Unfortunately, without specific access to those records or databases, I can't provide an exact manufacture date. It's best to contact Savage Arms directly or visit a firearms historian or expert for accurate information.
Not too old judging by that serial number. It is a more recent purchase.
1913
1913.
With the prefix of E its was made in 1983
i would need to know the serial number of your Savage model 99 rifle to determine the year of manufacture.