Hi JCS,
1st pic:
P.23B
No: 1 (146-C), 44.102
Sqn: 55 BS
Crew: Kpt. obs. Jozef Ludwik Skibinski, Sierz. pil. Stanislaw Pietniunas, Kpr. strz. January Jachimowicz. Poland, 1939. Under wing black 146-C. Red 44.102 on the left board.
Source: © Sent by Martin Wisniewski
2nd pic:
P.23B
No: 9 (112-N)
Sqn: 31 RS
Poland, 1939. Under wing white 112-N.
Source: © Sent by Martin Wisniewski
P.23B
No: 1 (01-L)
Sqn: 51st Line Sqn, 5th Flight Regiment
Based at Lida, May 1938.
Source: © PZL.23 Karas, Tomasz J.Kopanski, Artur Juszczak, 2004
P.23B
No: 2 (30-N)
Sqn: 42 eskadra liniowa, 4 pulk lotniczy
Source: © Sent by Martin Wisniewski
P.23B
No: 3
Sqn: 22 eskadra liniowa, 2 pulk lotniczy
Source: © Warbirds Resource Group
P.23B
No: 8
Sqn: 41 eskadra liniowa, 4 pulk lotniczy
According another source - 42 eskadra liniowa
Source: © Sent by Martin Wisniewski
Hope this helps.
S! Pisis