From Newsgroup: rec.games.pinball

I bought a large pile of Bally -17 and -35, in this pile there was one -133 that had already been converted to become a -35. My question is: Did Bally ever put out a -133 mpu that had the normal -133 printed in white ink? The one I have is just after the AS-2518 (printed in white ink) it is stamped -133 in black with a non matching font size. TIA, Tim, Stillwater, MN
--- Synchronet 3.17c-Win32 NewsLink 1.112

From Newsgroup: rec.games.pinball

On 4/29/2020 4:39 PM, MySeeburg wrote:

I bought a large pile of Bally -17 and -35, in this pile there was one -133 that had already been converted to become a -35. My question is: Did Bally ever put out a -133 mpu that had the normal -133 printed in white ink? The one I have is just after the AS-2518 (printed in white ink) it is stamped -133 in black with a non matching font size. TIA, Tim, Stillwater, MN

Not a direct answer to your question and you may already know this...
IPDB shows 5 games in the 1982-1984 time frame that used the 2518-133 MPU.

I looked it up because I hadn't heard of the -133 and thought it might
have been some type of prototype board.

- Kerry
--- Synchronet 3.17c-Win32 NewsLink 1.112

From Newsgroup: rec.games.pinball

Typical Bally. They Didn’t have any 133’s on hand so they took a -35 and changed the resistor to a diode and put a -133 stamp on the board.
--- Synchronet 3.17c-Win32 NewsLink 1.112

From Newsgroup: rec.games.pinball

There are lots of -133’s silkscreened in white. Hello Tim.
--- Synchronet 3.17c-Win32 NewsLink 1.112

From Newsgroup: rec.games.pinball

On Wednesday, April 29, 2020 at 8:33:02 PM UTC-5, jj44114 wrote:

There are lots of -133’s silkscreened in white. Hello Tim.

Hi Jack, I posted that stuff today. I suppose they needed a few more than they thought and went down to the art supply store and made due.
--- Synchronet 3.17c-Win32 NewsLink 1.112