Powering an old RC servo - Can't find the datasheet
This appears to be a scan of an old catalog.  

It lists the SM-351, and says it uses 100mA.

That appears to be in French.  I can't read French, but the designations are pretty easy to puzzle out.



As for the connections, they seem to be pretty standard.

Have a look here for examples.  Ignore the colors, and look at where the wires are in the connector.  Postive is in the middle, ground is one of the others.  Also, you can just buy the fitting connector with wires - they are color coded.



Regarding the low current consumption:

The servo might be intended for use with a higher voltage.  The catalog unfortunately doesn't list the operating voltage.

@Hayman found a picture that implies that the SM351 runs on 4.8V like most common servos.