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P-51 Designation Question

Sat Mar 04, 2006 3:35 pm

41-37320/37469 North American P-51 Mustang c/n 91-11981/12130. For RAF as Mustang Mk IA under Lend-Lease as FD418/FD567. Many were repossessed by USAAF before delivery to RAF.

41-37320 delivered to USAAF as P-51-1
41-37427/37429 delivered to USAAF as P-51-2

Can someone explain the -1 and -2 designation?
Thanks
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