Info on my razor

[StraightandNarrow]

You guys probably get this all the time from new members. I was given a straight razor as a gift, it was bought from an antique shop, I cleaned it up and was wondering if someone could offer me some help in dating it or any other information. I searched around for a bit but can't find exactly what I'm looking for. The stamp says William Bladwort and underneath it says Sheffield, but it looks like something is a little off with the stamp. The s in Sheffiield is smaller than the other letters and the E and the the L look like they weren't fully stamped. I originally posted this in the general discussion forum but was told to repost here. So far, members have mentioned that it's pre 1891 and it has a unique upside down stamp. Any other insight would be greatly appreciated! Thanks so much!

[lz6]

Hopefully one of our very well informed members will chime in about William Bladwort and his Sheffield connection. I do not think there is anything unusual about how the Sheffield
stamp took to the steel.

[Substance]

cant help sorry,
is the rareity for the tang stamp to be upside down to the etching like a factory bugger up ??
and if so would this make it more valuable due to rareity like a misprinted coin etc??