The Remington 1900 is a nice gun (mechanically the same as the 1894), but I wouldn't invest a lot of money in restoration. Pricing a hypothetical gun is difficult but a ballpack would be $300 poor -$1,200 top. Condition is king and 95% plus original condition guns will command a premium. Of course, it is all a moment in time and you need a buyer and seller. If only these guns were made by Winchester, they would be worth a fortune!