Numrich gun parts. Look under Remington SPT 58.
On the bottom of the receiver, ahead of the carrier cutout, or on the left side of the receiver toward the bottom. sales@countrygunsmith.net
It's date code stamped on the left side of the barrel in front of the receiver, check the Remington Society of America for location diagram and chart.
Yes, it is heavier and longer
The ones on the left side of the barrel by receiver are the date of manufacture code see related links for information on the Remington Society of America.
When or where? Where is the front of the receiver, when made check the manufactured date link on the Remington Society of America for details.
CHeck the receiver and barrel
Bottom of receiver in front of trigger
Try one of the various gun "blue books." Model 58s usually don't command high prices unless they are one of the more limited models. On the bottom of the receiver, in front of the loading port and behind the bbl is where one would find stampings if it is a "special model." Such as SA,SC,TX,TB. 3" guns and slug guns are also fairly rare. Skeet and trap bbls without the receiver stampings are standard guns with the barrels added. Go to Remington's website and do a seach on model 58s. This will give you an idea of what grades and varients are out there. If you have one of the stamped models, I would be interested.
No, the re4ar receiver face on the Model 11 Remington has a different configuration. The Remington Model 11 is a semi-auto with a tube containing a bolt return spring located at the rear of the receiver. The Model 11 stock has a receptacle to accept this tube, the Model 870, being a pump action, does not have this receptacle.
yes
Probably December 1930, it will be date coded stamped on the left side of the barrel near receiver, I suspect code: XY See related links for information on the Remington Society of America date code chart