This gun is rare enough that there is no "market value" established for it, at least in the US. I would compare it to an AYA or Ugartechea boxlock. Grulla is a more desirable maker that U. and, in my opinion would be worth more. A new AYA 453, plain back boxlock will go $3000 US, new. Used $1000 to $1500 or less for a gun as old as I suspect this Grulla is. The Grulla is nicely engraved and is a "fancy back" action, but the stock needs work. In the US, I would consider $1200 to $1500 to be a fair price for the gun. I have no idea how the Canadian market compares to a US price.