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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
$355 low end to $780
50-350 usd
Impossible to answer without the sn or date codes.
Remington Firearms Company during WW2
1911
41-70
The Remington Model 721 in .300 H&H was manufactured in 1948 with a 24" or 26" barrel.