Released 1964 by Supraphon SV 8225, made in Czechoslovakia
Any further info is welcome. This was a recording for the internal market with a standard Supraphon cover without any information except for the labels of the vinyl recording.
The cover with the painting and the texts by Václav Jan Sýkora are dated 1965 for the release 50618, which was a year later than this release.

Side A
00:00 Alonso Mudarra: Tiento
01:37 Antonio de Cabezón: Himno á 3
03:09 Vincente Rodriguez: Sonata E dur (Sorry I had to cut one bar at 4:27 because the vinyl was beyond repair)
07:24 Antonio Soler: Sonata a moll
10:39 Antonio Soler: Sonata Des dur
14:15 Cantallos: Sonata c moll
18:38 Freixanet: Sonata en Si be major

Side B
22:19 Felipe Rodriguez: Rondo in B flat major
24:42 Mateo Albeniz: Sonata in D major
27:55 José Gallés: Sonata in c minor
32:56 José Gallés: Sonata in f minor
36:58 Fr. Manuel de Santo Elias: Sonata para cimbalo
41:49 José Lidón: Sonata de 1. tons para clave

#VáclavJanSýkora