Hi Stower, the reference to the date is in the introduction to the Crown Garland section, have copied it below -

Early editions of popular Garlands are so rarely
to be found, that it has been thought desirable to
reprint, by way of appendix to the " Crown
Garland" of 1612, the additional ballads contained
in the almost equally rare edition of 1659.

Although many of the ballads are to be found
in comparatively modern collections, the present
copies seemed deserving of republication, as in
most cases they afford the earliest authority for
the text.

An edition of the " Crown Garland," printed in
1692, is in the British Museum, and another,
the date of which is cut off, is preserved in the
Pepysian Library.

The edition of 1692 corresponds in its contents
with that of 1659, now reprinted, and for the loan
of which the Percy Society are indebted to the
liberality of Mr. J. Payne Collier.