Osborn in script is correct. The crown over inspectors number is a Tower mark, there are examples with numbers higher than 27, so that is okay. If
original your socket will date between 1796 - 1808, after which it was Osborn & Gunby. Reference "British & Commonwealth Bayonets" by
Skennerton & Richardson, pp. 56, 57.
The reference also includes a photo of Osborn in italics & an X below that. ...



