Parlor or parlour guitar usually refers to a type of acoustic guitar smaller than a Size No.0 Concert Guitar by C. F. Martin & Company. Mottola's Cyclopedic Dictionary of Lutherie Terms describes the
Parlor guitars in 19th century: Washburn Parlor Guitar (1894) Washburn "New Model" (1896)
Spanish-style (c.1845) / Size No.3 (3-17) (1859) guitars by C. F. Martin
Very first Size No.1 guitar with earliest X-Bracing (1842) by Martin & Schatz
c.f. Size No.0 (0-45) guitar played by Joan Baez
The Baroque guitar is a string instrument with five courses of gut strings and moveable gut frets. The first course sometimes used only a single string.
Parlor guitar
…Fingerstyle guitar — Finger-picking style is preferred on Parlor guitars (in contrast to the strumming style on Dreadnought guitars) Baroque guitar — small guitars in Baroque era Early Romantic guitar — small guitars from 1790 to 1830…
Baroque guitar built by Matteo Sellas, c. 1630–50
The guitar player (c. 1672), by Johannes Vermeer
Double guitar (1690) by Alexandre Voboam, 1690 (exhibited at Kunsthistorisches Museum)