The THREE sets of writing at 1522, 1525/6, 1625 and BTW lib1625 means "liberated at 1625"
Two people *plus* one of them using two pens at different times = confusion:
There are indeed two people involved but that's not indicated by the light/bold writing.
A little bit of this speculation but I reckon it'll hold up pretty well to examination:
The "To=X02", "Number of copies sent=2" boxes and the signature were written by the Sgt at the same time he would have filled in an accompanying form containing the *cleartext*.
The florid version of the number "2" appears nowhere else but the impression on the paper of the signature appears to match them - and the slant on the "T" crossbar is certainly different from the cyphertext.
All the rest was written by the same person (the coder/pigeon-fancier) since the form of the letters and numbers is identical *but* with two different pens (light/bold), at different times. Why?
It helps to understand that NURP = Non-Unit Related Personnel - one term used for the birds themselves!
Designations included (see below for full list of Dicken Medals awarded to pigeons), eg NURP.36.JH.190" - exactly matching the format on the form.
It's therefore obvious, IMHO, that after being handed the cleartext he filled out the "Time of origin" and coded the message - appending the time he carried out the coding at the end indicating that it had been dealt with immediately. Why 25/26? Maybe a stickler for being precise - it was 15:25 plus 20 seconds?
He then wandered over to his pigeon coop an hour later, not bothering to carry his pen with him, selected a couple of birds (two copies) and added both their IDs with a different pen.
Plus the time he LIBERATED them - "lib. 1625".
The times are Origin -> Coding -> Sending. Simple. The only other two numbers on the form - 27 - may be a one time code reference.
Another couple of points:
1) It seems a bit peculiar that there's no originator/date - possibly indicating that such info (if the bird fell into the wrong hands) would itself be of tactical interest and so also encoded. Or maybe the ID numbers of the birds were enough to keep the identity of the originator secret?
2) Two birds were sent, a sensible precaution. If the other one got through and these messages were filed and kept then a search for other messages sent by the same Sgt with a similar timestamp may turn up the decoded version.
A complete list of pigeons awarded "THE DICKEN MEDAL"
NEHU.40.NS.1 - Blue Cheq. Hen "Winkie"
MEPS.43.1263 - Red Cheq. Cock "George"
SURP.41.L.3089 - White Hen "White Vision"
NPS.41.NS.4230 - "Beachbomber"
NPS.42.31066 - Grizzle Cock "Gustav"
NPS.43.94451 - Dark Cheq. Cock "Paddy"
NURP.36.JH.190 - Dark Cheq. Hen "Kenley Lass"
NURP.38.EGU.242 - Red Cheq. Cock "Commando"
NPS.42.NS.44802 - Dark Cheq. Cock "Flying Dutchman"
NURP.40.GVIS.453- Blue Cock "Royal Blue"
NURP.41.A.2164 - "Dutch Coast"
NPS.41.NS.2862 - Blue Cock "Navy Blue"
NPS.42.NS.15125 - Mealy Cock "William of Orange"
NPS.43.29018 - Dark Cheq. Cock "Ruhr Express"
NPS.42.21610 - B.C. Hen "Scotch Lass"
NU.41.HQ.4373 - Blue Cock "Billy"
NURP.39.NRS.144 - Red Cock "Cologne"
NPS.42.36392 - "Maquis"
41.BA.2793 - "Broad Arrow"
NURP.39.SDS.39 - "All Alone"
NURP.37.CEN.335 - "Mercury"
NURP.41.SBC.219 - Cock "Duke of Normandy"
NURP.43.CC.2418 - B.C. Hen
NURP.40.WLE.249 - "Mary"
NURP.41.DHZ.56 - "Tommy"
42.WD.593 - "Princess"
USA.43.SC.6390 - "G.I. Joe"