Checking Air Force Lists shows that P/O R L Saunders was serving with No.57 Sqn from Nov 1938,
Checking furher back in 1938 he is listed as RAFO (Reserve of Air Force Officers)
So service prior to 1938 as either Commisioned RAF/AAF/RAFVR regular or direct Commisioned entry to RAFO,
Transfer from P/O RAFO to P/O RAFVR and new personal number issued.
Searching futher in The Gazette
He was Commissioned into RAFO 21st Dec 1936
https://www.thegazette.co.uk/London/...e/171/data.pdf
Confirmed
19th Oct 1937
https://www.thegazette.co.uk/London/.../8139/data.pdf
Ross