You have a 1890 Trapdoor made in 1891. Between $250 to $1000 depending upon condition. FYI 1890's were used by the USMC
$500 to $1000
50-1000 usd
Only for 45 55. I believe all trapdoors made from 1873 on were only 45/70 caliber
made 1874. if a Carbine it might be around Custers time
i have one in my garage. i want to sell it
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.
The best answer I can give you is to post at http://www.trapdoorcollector.com/
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Maker and price