Apparently Victor Collette was not a prolific gunmaker. I can only find one other reference to his work. That is a pinfire revolver, so apparently he was active in the last half of the 19th century. If you examine your shotgun, you should find an oval surrounding the letters ELG and a star. If there is a crown over this oval, the gun was proofed in Leige, Belgium, after 1893. If there is no crown, it was proofed earlier. Thousands of similar guns were imported to the US in the late 1800's and there is little collector interest in them. They are valued primarily as decorators and usually sell for less than $200.
As in Australia?
Victor was forced into exile during the reign of Napoleon III.
That would be a Stevens/Savage 315 with a Montgomery Ward name.
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From your limited description, I'd say: Probably 1890-1914. No, not safely. Very little ($125-$150 as a mantle decoration).
the year this gun was made was 1913. the ds grade is worth $250.00 poor to $1250.00 exe
He came to Australia when he was 15 He graduated at Sydney University. HE WAZ NICE! WE THINK! DANDANDA
Manufactured between 1886 and 1916. Retail value $50-$75 unless in like-new condition.
Built c. 1930-1948 by Stevens division of Savage Arms. If in useable condition, possibly worth $200+.
Not sure if this is your gun, but Leader Gun Company was a trade name used on shotguns retailed by the Charles Williams Stores, Inc. of New York. Most likely manufacturer would be Crescent Arms, Norwich, CT. "Nitro" would imply proofed for smokeless powder.
I doubt if you will find any books on Crescent shotguns. As one person on another board explained "people with $50 guns don't buy $50 books to read about them". Joe Voresik is working on a new edition of "Shotgun Markings" which may include a lot more information than is currently available.
Facts that happened are historical facts.