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The razor was made by John Sellers before 1855, when the company was restyled John Sellers & Sons, after the founder death.

http://www.strazors.com/uploads/ForSale/28_06_2012/seller_1.jpg
...

The Osborne, Garrett & Co. addresses were:
51 to 54 Firth Street; 8 to 11 Bateman Street & 34 & 35 Dean Street London W1; & at Birmingham, Glasgow & Manchester.

Joseph Westby, Sheffield in ivory.

http://www.strazors.com/uploads/ForSale/28_12_2011/ivory_1.jpg

http://www.strazors.com/uploads/ForSale/28_12_2011/ivory_2.jpg

The founder of the company...

Pair of Mappin & Webb in ivory.

http://www.strazors.com/uploads/ForSale/27_07_2011/map_6.jpg

http://www.strazors.com/uploads/ForSale/27_07_2011/map_1.jpg
...

Joe,
You're absolutely right, stainless steel will rust.
But stainless steel don't have the same patina.

P.S. Hmm... May be, create another topic for this discussion.

Yes. I saw this razor.
This razor was made by A.T. Jordan for A.J. Jordan.
A.T. Jordan used the trademark "Old Faithful", and he was in Sheffield.
And he was in business 1880 - (1919).

P.S. I...

If you have such info, I'll glad to know the source of it.
Thanks.

About steel.
I never saw such patina on the stainless steel.
But, it's only my experience.
Maybe I'm wrong.

P.S. But according years of company work. I don't think, it's stainless steel.

And some words about Andrew J.Jordan.
This was an import company in St.Louis, Missouri. The company was in business 1878 - 1926. Their cutlery was made both in England and Germany.
The trademark...

You're right, difficult, but possible.:)
(If you'll put a bigger razor photo, would better.)
The patina on the tang is look like carbon steel.

Can I ask, why 1890-1910? And why stainless steel? As I see on the picture, it's carbon steel.
Note: stainless steel is used since 1913.

Mappin & Webb.

George Johnson, nice old razor from Sheffield.

William Greaves in Wiki.

"Brookes&Crookes".
The company existed 1858-1947 in Sheffield.
Blade 7/8, ivory scales.
Unfortunately, it was not possible to clean a rust on the shank, without changing the form of the shank....