Scanned from paper Feinsliebchen Barock is the thin form of a Baroque initials typeface which is known as Kanzlei Initialen. The accompanying font in the illustration below is Germanica (original name Fette Kanzlei) which can be downloaded from
www.dafont.com as well. The font Feinsliebchen Barock is public domain, free for all uses, commercial and private.