Obviously French, but not much else. The proofmarks under the barrel and type of action will help date the shotgun.
AnswerNeed more information, such as model number and condition. Stevens made several types of .410 shotgun. sales@countrygunsmith.netMY SHOTGUN IS A PUMP WESTPOINT MODEL 167 STEVENS ARMS WESTFIELD MASS VERY GOOD CONDITION
The ROBUST shotgun was made by Manufrance, which was France's largest private gun manufacturing company. If you look underneath the barrels, it should be marked as to year of manufacture. Value is going to have to be determined by a hands-on appraisal.
The users of them.
Perhaps you mean 1907. In any event, it is the 'Crass' model Ithaca shotgun made in 1902. Value is dependent upon grade and condition. sales@countrygunsmith.net
Or Brazil and ERA? Inexpensive firearm (what would you expect from Kresge) imported back when Kresge was still in business. Probably not worth over $50 if it is a single shot.
100 yrs
Fusil Robust is a model, not a brand. Made in St Etienne France by ManuFrance, in business since the 1910's. Not true.
Without a detailed description, it could range from 10-10000 USD
The value of any "Antique" is always a very subjective opinion. research what a similar item has sold for and you will have your answer.
$500
If you have a semi-new shotgun, you can pickup the gun buyers guide from borders or a local book store. If your talking an antique shotgun, then they may have books for that, but I have not looked into it before.
Library, internet, Standard Catalog of Firearms.
See related link.
This needs more information. Such a gun would be a percussion weapon, and possibly converted from a rifle, assuming 1846 as a mfr date. Get photos and post them on one of the antique firearm fora.
A Damascus twist steel double barrel shotgun is an antique shotgun made by layering iron and steel and welding them together. This kind of shotgun is worth approximately $3,000 depending on the condition of the weapon.
500 to 1500
Really not possible to answer without gun in hand. Value of antique arms is driven by condition.