Is anyone able to identify the model (and date/year of active service)
of the following P51s? (and how do you tell!)

http://triptpolers.houseoftucker.com...ohour/zh72.jpg

They appear towards the end of the Star Trek - Enterprise episode
"Zero Hour" - one of the NX01 shuttles are attacked by them...

(Now they could be fake - as no-one is sure whether the NX01 shuttle
is in the past or an alternate future)

Cheers,
Richard