Here is the 5 watt radio.
It has the original paper decal on top reading :
2864 948
Model 389
Mark M 2 (?) 2 is what it appears to be

Appears to be Motorola ?
It is completely unique internally compared to all the other'68 - '69 radios I've had .

The pointer is white from the factory
The push buttons are chrome , with a pattern on top

My 1968 Chrysler parts book list it as :
Model 389 , Deluxe , AM, W , PN 2884064

For 1969 it is listed as :
Model 389 , AM Deluxe , W-P , W-S , Fastback PN 2884064