Fair price for a rearsonalized colt 1911A1?

[mac]

Folks, local gun shop has what they believe is a rearsonalized Colt 1911A1. The slide is a 1911A1, however the serial number for the receiver makes it a 1911 Colt from 1918. Serial number is 469737. The trigger is the only thing that does not look original. they want 1400 but was going to offer 1000. Is 1000 a fair price or is this weapon worth less since it is a GI mixmaster.

Thanks for your help.

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