Help identifying a stepper motor please

Hi Group,

I'm planning to upgrade a Denford Triac 3 axis training mill to EMC
using Gecko 201's or maybe 210's and although all three stepper
motors look identical only one has markings (the Y axis).

It is a Sanyo Step Syn Type 103-807-0645 )Lot 03827)

It is an 8 lead stepper, with four of the leads taped up and
individually isolated (Pink, Yellow, Blue, Orange) and is driven on
the other four (Grey, Red, Black, White)

I'm somewhat puzzeled by the lead configuration but don't want to
pull it all apart just yet as it's working.

Can anyone help with a spec for the motor, and also can you see any
good reason for the 3 axis's motors being anything other than
identical?

TIA,

Andrew