Tony
I thought you had Barry Rosch's production list.
According to that, WNr 0021 was built/delivered in May 1941, ie basically at the same time as 'our' Leopard was photographed.
And, yes I notified Malcolm. An opportunity for him not to be missed.
Will send you the list straight away.
BTW Rosch does not list any TD+IL at all, he has only WNr 0031 fixed as TD+IU plus others in the same range without any WNrs attached.
Cheers
Stig