I've got no idea, mate! It's only an Amiga Format 117a coverdisk, so I should hardly think it can be that rare, but it's not available at AMR (and neither is the AF117b disk), and nobody else has admitted to having a copy of it either.
Meanwhile, I've successfully recovered about 98% of a valid disk image from Titler's original disk which had been partly overwritten, unfortunately.
My disk image, when it's finished will work 100%. The boot sector and volume creation time and date may not exactly match an original disk (though it will be close), but everything else will!