Hi Group,  On pages 26 and 28 of "Treasures Of Mechanical Music"
the scale for the 15-1/2" Regina disc musical box is shown:

 1 G
 2 G
 3 C
 4 C
 5 C
 6 D
 7 E
 8 F
 9 G
10 G
11 A
12 B
13 C
14 C
15 D
16 E
17 E
18 F
19 G
20 G
21 A
22 B
23 Middle C
24 Middle C
25 D
26 E
27 E
28 F
29 F#
30 G
31 G
32 G
33 A
34 A
35 B
36 B
37 C
38 C
39 C
40 C#
41 D
42 D
43 D#
44 E
45 E
46 F
47 F
48 F#
49 G
50 G
51 G#
52 A
53 A
54 A#
55 B
56 B
57 C
58 C
59 D
60 D
61 E
62 E
63 F
64 F
65 F#
66 G
67 G
68 G
69 A
70 A
71 A
72 B
73 C
74 C
75 D
76 E

Jack M. Conway, Los Angeles, California, USA