I have personally handled over 1,000 68-9 B body AM / AM FM radios and have NEVER seen one with chrome push buttons. I have , however, seen plenty of A and C body (chrome buttons)radios with parts swapped over in an attempt to make a B body radio.

Greg

This is the "68" B body face with pentastar.
AM FMs were factory available in 68 on the B body . I have had original dealership brochures for Satellite / Coronets etc. showing it as a
factory option.

Greg

To ad to the debate, their is a chrome button 5 watt(?) early 1968 B body radio shown in the Sams manuals (looks alot like the music master found in the Monoco) however, I have not had one in my hands, and they are visably different than the
typical Bendix B body radios.

Greg

not to get to far off subject why is 1/2 the face blacked out on a 70 b body am & am/fm

As far as what I've seen for factory installed '68 b-body radios:
sales code
420 AM radio w/stereo 8-track tape $196.25
421 Music Master AM radio $61.55 - 2 watt
422 Astrophonic AM radio $92.70 - 5-1/2 watt & CHARGER ONLY

I believe 423 is the correct buildsheet code for B body AM FM in 1968.

Greg

What is sales code 423?

You learn something new everyday.

R/1 -- 2 watt "Music Master" AM radio

R/2 -- 5-1/2 watt "Astrophonic" AM radio - early - Aug. '67

R/2 -- 5-1/2 watt "Astrophonic" AM radio - late - July '68

What does it look like on a Lynch road tag?

same in '68

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