Not that it will tell us anything about what model it is , but have you weighed it ?
Can you measure it ? Look at the way the disc is measured here : http://infinitediscs.com/innova-ape/
On the bottom of the disc is there any markinng at all ? No penned in weight or initials of any kind ?
DX Birdie 175g, Opto Pure 170g, VIP Warship 168g, DX Leopard 146g, Medium Trak 157g, Medium Lace 163g, RHBH , RHFH , RHOH
Just friggin do it.