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I don't think I could say that my best shaver (in terms of edge retention, closeness of shave, etc.) is the same as my favorite razor! Also my favorite razor tends to change over time.

I've never heard of a fake razor box. There are lots of original razor boxes out there for sale. I think that if one were faked, it would be recently for an extremely rare and expensive...

Hard to tell from the pictures because of the different angles but I think you're right, the tail on the OP's razor looks a little stubbier and so do the scales. But probably still a perfectly good...

http://straightrazorpalace.com/razors/98309-78-f-herder-abr-sohn-5-8-picked-up-curious-history-probable-age-etc.html

BTW it is ground like a Herder #78; no way to know if it was made by them for export. I have a Dame & Stoddard razor that was in a case marked with both Dame & Stoddard and Henckels, but no...

This looks like a standard German or U.S. 5/8" razor, not much hone wear and perfectly good to shave with. If you're interested in straight razor shaving it would be a fine razor to start with, but...