Adam
A total of between 25 and 27 He 59 were used by AS./88 in Spain
As far as I know nothing is known about their WNr or former SKZ
Their s/n with Legion Condor was 521 to 526, 528 to 546 or possibly as high as 548, but the last two are undocumented. At least 17 were totally written off with AS./88, but the number is probably higher. Very few of these are identified from Spanish sources. Most of them flew unmarked and it is very difficult to ID anyone from existing photos
The survivors were handed over to the Nationalist side who gave them type number 71. Some sources say they were re-serialled already when in use by AS./88. I have very few photos of 71 registered He 59, in fact the only one I know of is 71-2
The number of survivors when handed over is reported as five.
Cheers
Stig