Hello, I have this pair of what I thought was modern 501s, but noticed a "This is a Pair if Levi's" authentication printed on the inside pocket. There is a trademarked year on it, would this help date my jeans? I can't make it out. If anything, I think it would be 90s, maybe 1992? I found different years on levis jeans for sale when I reverse image searched it. This pair could just be modern within the last few to 15 years though, but it never hurts to ask. Thanks! It *looks* like 1841 which makes no sense at all! I also thought it could be 1873, which is when they received their patent, but since other similar pairs of 501's say 1993 or 2010, I am hoping this pair has it's actual manufacturing date as well.