Looks as if they once made some Leica USA branded special in a edition of at least 40. If that was a commemorative edition, it might be worth a bit more than the average pimped Minolta XD7 (a.k.a. Leica R4), if it was a discount version, it won't make a difference. In any case, even a 100% extra for that badge would not make it worth much, as the R4 is about the most common and least collectible item ever made by Leitz/Leica. Don't collect it, use it - later revisions are the most reliable and least quirky of all Leica SLRs.