Recently bought a used Victorinox from a charity auction site, appears to be a Infantry model Chrono, overall it looks good, but, it doesn't have any model or reference numbers on the case back. markings on the face seem correct, just seems odd to me there are no reference numbers anywhere on the watch. only paid $40 for it and it was for a good cause, so if it's a knockoff I am not really to worried about it, just nice to know what I have in case I need it serviced.