Anyhoo....there's a chance that there might be a:
N1613, N3513, N4113, T3913, V1113 and AA313...
If so, N1613 would have been one in batch of 202 airframes, ordered in February '38 and delivered between June and October '40...
If there was a N3513, she would have been in the same batch as N3313, which was 161 airframes , ordered in May '38 and delivered between November '40 and February '41...
T3913 and N4113 would have been in the same batch, which this time was 150 airframes, ordered in December '39 and delivered between February and April '41...
V1113, if there was one, was part of a batch ordered in February '40 and this was of 50 airframes, they were delivered between April and June '41...
....and lastly, AA313....she would have part of a batch ordered July '40, this time 73 airframes, which were delivered June '41 and May '42...