Don is correct, your very fine Marlin Model 1893 left the factory in early 1896 with a 26 inch half octagon barrel in .32-40 caliber, half magazine, takedown, pistol grip stock.
Frankly, with prices currently seen at auction, $10,000.00 is way to conservative. I would expect to see it closer to $12,000.00 and maybe a little more. If it were mine, I would insure it for a minimun of $15,000.00. You should be able to contact your household insurance company and get a "Fine Arts Floater" policy to cover this piece separately. Prices vary from $1.00 per $1,000.00 of value and up depending upon the company. The NRA offers gun insurance too if you are a member.