At to the Revitt - Revit thing, I've had razors where letters - especially at the end of names - are missing, sometimes due to wear, sometimes a bad strike from the drop hammer. 'Revit' isn't an English spelling as far as I know so I would guess Revitt is correct. I would put the dat of the razor about 1835 - 1850.
Thanks Gugi for the list - it's handy as it prdates my 1834 item. BTW I will be putting (and indeed have) some old boys on my sitre soon (there's a John Barber on there already).