ITALIAN HARPSICHORD, SIGNED MARIO SERAFINI 1699, POSSIBLY ROME

According to Prof. Dr. R. Ewerhart, the instrument was built by Mario Serafini 1699 in Rome as a false-inner-outer. According to him, the instrument is signed inside under the soundboard. The tuning pins present appear old and are not drilled. On the keyboard frame in the middle of the keyboard rest pad possibly a number sequence 169[1?] can be read. The key c3 is signed with the number 1699 in ink.
The keyboard (GG-c3 [GG, AA, HH, C-c3]) has a 3-octave-span of 48.0cm. The instrument has two rows of new jacks equipped with Delrin. These are marked P I and S II on tone GG. This designation indicates the intonation P[rincipale] and S[olo] (some historical jumpers and case parts exist separately).
The c2-scale is 357mm, the f2-scale is 270mm.
Dimensions of the instrument:
Length: 2175mm
Width: 817mm
Total height: 1034mm
Body height: 241mm
The instrument was restored around 1981 and is in playable condition.