I have a lot of blades that are from the second half of the 19th century.
These three are my oldest, all of them were made prior to 1850. At one time I thought that one of them was made pre-1800, but after doing a bit more research I don't think so anymore.
At any rate, these are regular shavers for me, and all of them are creeping up on their 200th birthdays. :)
Sorry about the pic. If I have time tonight, I might try to get some better pics of these.