I too have noticed this and think it has been debated here before. As far as I can remember the numbers serve no purpose and are more to do with the manufacuring process than actual useage. Also it has been discussed that flipping the blade serves no purpose whatsoever.
I've heard from a few different people here on the site that the numbers on some razor blades (such as Iridium Supers) are put there by the manufacturers for quality control purposes.
I tried flipping my blades for a while, but I found no benefit whatsoever to doing so.
Welcome to B&B. I don't think flipping the blade would serve any useful purpose. There are only 2 edges on a DE blade, and even if you flip the blade in the razor, you are still using the exact same 2 edges. Just my 2 cents!
Welcome to the B&B. I flipped the blade once, but quickly found that shaving with the spine of the straight razor isn't nearly as effective as using the blade!
Welcome aboard. As for flipping the blade, it's merits you nothing so there is no point to doing so. Those numbers on the blade are used by the manufacturer for internal purposes (e.g. QC).