This series of motor often had an OEM number, so you may not find it in the Electro-Craft list.
I have the Specs for this range of servo, if it has two sets of brushes, one pair will be the Tach and the other the armature.
If you give the dimensions and a pic if possible I can give you the rough Torque rating, the voltage can be determined by spinning the armature at a known rpm and measuring the DC voltage, This series of motors varied from 1850rpm to 6000, so you may have to conservatively rate it for rpm.
The Generated voltage will be equal to the applied DC for a particular RPM.
The armature will be the larger of the brush pairs.