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+1 on Euclid's post! :)

The 31st Regiment of Foot became the East Surrey Regiment in 1881. The tang is stamped Germany, so the razor was likely made after 1891.

It's plausible the razor was...

Yep, it's British military issue.

The "WD" does stand for War Department. The "/|\" is known as the "broad arrow," and was used by the WD to mark military equipment.

The 71 and 1879 are...