24 inchs was as short as the factory made. Carbine's usually are 20 inchs or less.
$500 to $1000
made 1874. if a Carbine it might be around Custers time
The 45/70 is best kept in the 0-150 yard range out of a lever gun.
You have one of the variations of Marlin 1895 - the G, GS, S, Cowboy, or Guide Gun. The value depends on which model you have and who you can find to buy it. The prices run from $400 to $700.
4570 g = 4570000 mg
There are 1000 millimetres in one metre. Therefore, 4570 millimetres is equal to 4570/1000 = 4.57 metres.
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Maker and price
http://www.gun-data.com/springfield_trapdoors.HTML , this website indicates your 1873 Springfield trapdoor carbine was made some time in the first half 1884. It couldn't have seen battle with General Custer,but more than likely help tamed the Alaskan wilderness. ahhh, what that gun could have seen!
the century limited nib is about $ 995, exc is $750. the cenrury limited employee edition nib is $1450 and prices are open going down
Assuming that milemmeters is really millimetres, 4570 mm = 4.57 metres.