The Collaborative International Dictionary of English v.0.48:
Specialty \Spe"cial*ty\, n.; pl. Specialties. [F.
sp['e]cialit['e]. Cf. Speciality.]
Specialty of rule hath been neglected. --Shak.
2. A particular or peculiar case. [Obs.]
3. (Law) A contract or obligation under seal; a contract by
deed; a writing, under seal, given as security for a debt
particularly specified. --Chitty. --Bouvier. --Wharton
Let specialties be therefore drawn between us.
4. That for which a person is distinguished, in which he is
specially versed, or which he makes an object of special
attention; a speciality.
Men of boundless knowledge, like Humbold, must have
had once their specialty, their pet subject. --C.