This looks to me to be an old husqvarna military carbine someone has decorated up to make some money on. Good story though :european manufacture for sales to the indians"...

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one of the most common "fakes" in the antique/collectable gun business is the "indian gun"  along with the "trappers cabin" rifles.  Anyone with an old beat up gun, some old brass tacks rusty wire, and rawhide can make one up---and many many have done so.  There may well be some real ones that are well documented but unless there is real solid authenticated provenance documentation I automatically consider any such to be fakes----no matter what the current owner/seller believes. 
And fwiw, just because it was in a museum at one time proves total zilch.  many older local museums had staff with little or no skill, and even less firearms knowledge. 
 
An examination by a knowledgable student shows most up pretty quickly.

bear in mind too. that a beat up old winchester model 70 or even  an AR15 picked up on an indian reservation last summer is a real  "Indian rifle"

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Indian rifle? - Husqvarna with serial on the butt plate
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don;t know about the rifle/action-----seems too new to me.   BUT those tacks are all just WRONG and there is no patina around them.  Butt plate and wood juncture is too clean and sharp.   Run away from that one VERY fast.

just looked at the pictures.  I have seen and handled a few genuine plains indian rifles,  a couple 'rollers a Henry and a couple Spencers, plus some flintlock/percussion trade guns.   That thing barely qualifies as a poor quality fake---just based on tacks, rawhide and lack of patina.  I tried to send the seller a message, but I'd have to register on GB and I don't want to do that.  He says its consignment,  either he's playing dumb to hook a sucker or someone is trying to pull the wool over his eyes.  Better add this is just my own semi-educated opinion

I posted a link to this thread to the seller and got the following response.

"I listed that one a long ago and kind of forgot about it.  I tell everybody in my store that it was made to deceive, but when I originally listed it (automatically relists) I just used the consignee's description (came in with a very large group of guns)."

Begs the question: If you know it is not what you claim why have you not corrected the lsiting...

SS    

Would make for a neat lamp stand.

This gives me an idea, a couple of years ago a friend gave me an incomplete SMLE No.4. I should go by ACE and get me a few tacks and some raw hide, make a pretty rare "Indian Rifle".

No firing pin, I have  Norway roller, broke the pin, if it is like it there are not any pins I had to get a man to make me one. Huge pain.