So the source would be the 4FG Association's pdf of Leonard Werner. Probably
http://www.americanairmuseum.com/aircraft/14028 has the info from there.
The attached photograph shows "Frankie". The serial on the tail begins with 4. I gather 41...1, and if one considers that the last two numbers are close together it may well ends with 11.
There were 6 different P-51 with code QP-Q - besides 44 -13411:
1. 43-6690 P-51B 334 QP-Q
2. 44-14142 P-51D 334 QP-Q
3. 44-14202 P-51D 334 QP-Q
4. 44-14292 P-51D 334 QP-Q "Floozy Suzy"|
5. 44-73141 P-51D 334 QP-Q "Anne II"
1. is a B thus can be excluded
2. Ends with a '2' thus can be excluded
3. Ends with a '2' thus can be excluded
4. and 5. Have different nick name.
Is this enough 'proof' to conclude that 44-13411 was "Frankie"? We do want to mention it on a memorial in Zeewolde (NL) where the P-51 went down on 20 november 1944 (former lake IJsselmeer).
What are your thoughts?
--Cees