Australia One Shilling Lyre Bird 1937

Hi to all
I hope that some-one out there can help me.
Sorry for the bad pictures but I just can not get a scan of the watermark.
I have just examined 50 copies of the 1937 One Shilling Lyre Bird and I think that one has part of the watermark reversed.
One of the COA has the C reversed, this is the COA near the bottom of the stamp.
Has any-one seen this variety before.
I have had three members of my family look at the watermark and they all agree that one of the C"s is reversed.
Any help would be appreciated.
Regards
Horamakhet