The photo caught my eye as I was doing some surfing. I bought a rifle .22 cal that looks identical with a serial number of 21700 on the left side of the receiver. However, there are no numbers on the bolt or any other place. I also don't see a lot of info out there on Schultz & Larsen. I see there is a reference to a book but I couldn't find it anywhere on the internet. It must be a foreign publisher and I'm not sure who would carry it. My main question is what model is it and possibly what the date range might be.