An Unusual F-4 Oval Hole Mandolin
The 525 model was Ibanez’s F-4 style mandolin and featured an oval soundhole, no headstock binding, and a single ply truss rod cover.
Kevin has shared pictures of his early Ibanez 525 mandolin, which have been posted in the serial number database.

Kevin purchased this mandolin in about 2002 from Cripple Creek Music in Ashaland, Oregon, USA. There is no serial number and no label inside, dating it to about 1975, although the angled corner truss rod cover is normally seen on mandolins with serial numbers. The headstock inlay is also more typical of the 522 model. There appears to be an imprint on the back of the headstock reading Q10. This one appears to be a bit of a mystery!
