[Motorola] What is this radio worth?

[FireBrick]

I was given a GM300
with the model number of:
M34GMC29C3AA
and a SN of:
150twac500

It has an attached desk microphone with the label on the base of:
HMN3000B-9611

there is also a plastic base attached to the radio.

No other info, cords, powersupply.
I do not know if if works.

I 'believe' it was used for a corporate security personel at a large, now bankrupt electronics firm as it was found when cleaning out the security office.

A Motorola guy said:

If the model number is right, it is an 800mHz 16 channel radio, 30 kHz
channel spacing, with a 15 watt transmitter. 

Can anyone shed some light on what this radio is?