Difficult to say, i wish there where more pictures. What we can see however is that the piece has been cleaned, probably with acid. Stripped from all its original patina.
The barrel is in the style of the 1470-80s with the octagonal barrel with the flats turned halfway down. Also the swamped muzzle, beeing a predecessor of the maximilian barrelcrown. The barrel hook is far on its way towards the muzzle which is also a later charasteristic.
As to the stock, hard to say.. can't remember any manuscripts with such a stock, seems a bit hard to handle as well. The tinder holder looks more like those from Indian and middle eastern type matchlock guns, by that time they would surely have made something different.
All in all i would not touch it, especially not before having better pictures.