The Remington Model 740 was manufactured from 1955 to 1980. To determine the specific year of your firearm's manufacture, you can check the serial number, as Remington provides a date code based on this number. If you have the serial number, you can consult Remington's records or online resources for precise information.
the 740 is a very old model, they sell for $250- $350 in this area
It will vary with caliber.
Starting in 1921 Remington date code stamped all it's firearms on the barrel. You can look up the details on location and the code table on the Remington Society of America on the Manufactured Date link.
100-400 USD
depending on what you want to know the Remington model740 is the previous model b4 the Remington 742 they were chambered in many calibers for deer hunting and had a 5 rd clip
Remington Firearms Company during WW2
$355 low end to $780
50-350 usd
Impossible to answer without the sn or date codes.
41-70
1911
The Remington Model 721 in .300 H&H was manufactured in 1948 with a 24" or 26" barrel.