Can anyone tell me the RG and Diff of the old Brunswick Mark X?
What ball available today would match up with it the best for reaction?
Anyone have one for sale?

Thank You

Okay here we go, I found the original patent for it.

Inventor:   Carmen M. Salvino
https://www.google.com/patents/US4320899?dq=inassignee:%22Salvino+Carmen+M%22&hl=en&sa=X&ei=17YmVKGcI82syAS88YKgAw&ved=0CDQQ6AEwAw

Yes the ball doesn't have a pancake, all it has is a small block for the fingers and small block for the thumb.


FIG. 2 is a schematic representation (partly in section) of the preferred embodiment of the bowling ball of this invention and showing the position and location of the weight blocks;


side note:
Excerpt about Wobble from the patent:

A bowling ball that is not dynamically balanced will, among other things, wobble as it is rolled down a lane. Evidence of wobble behavior can be seen in the flared nature of the resulting ball track on the exterior surface of the ball. Wobble behavior can also be observed by a trained individual standing at the foul line or on carefully obtained high speed films.

A wobble condition due to dynamic imbalance in the ball produces numerous variables which affect the ability of the bowler to consistently use the ball to obtain high scores. Bowling with a consistently high degree of scoring requires accurate placement of the ball in the strike zone. When a spare is desired, a high degree of accuracy is required in order to knock over a pin or, in some cases, achieve a desired degree of pin action in order to knock over a number of standing pins. Dynamic imbalance in the ball impedes the ability of the bowler to control his game

I was still learning quite a bit about the game back then as an enthused 18 year old, but I always had heard the Orange Dot was Columbia's only foray into the rubber ball market. They were trying to get the LT-48 throwers that also like the bleeder yellow dots to buy Orange Dots.

I remember owning a Wine U-Dot which is what I always thought was the first urethane by Columbia.

I seem to remember seeing an article about Dave Husted's early years stating that he felt behind because Columbia was one of the last major ball companies to get a urethane ball out. Of course they cornered the market with the Black U-Dot back then a few years later........

This also reminds me of the Columbia Orange Dot, its first foray with urethane:

Besides, the LT-48 was such a game changer, who needed a Mark X?

I remember the Gold Dots. The shop that I started to frequent in the late 80's really pushed those and the pricing was on the cheap for that era.

Bowling ball history from the 70's - early 90's is kind of fascinating as each company had their "answer" to another companies success story. Plus some of the regional success stories... I live in central Ohio so we were close to where the original Star Trak's (Track's original plant in Solon near Akron) were put out. Lots of Force Ten's on racks around here in the early 80's.

Getting back to the original topic, I had always heard that the Mark X was to be Brunswick's answer to the bleeder. Or at least they tried to have it be. I also heard they used crushed walnuts in the core material and supposedly continued that with the Edge. The Edge was the first urethane I ever threw and when the lanes had a little more oil in the front or middle, it was huge compared to my bleeder. I also had a teammate who would not bag his Mark X until it finally just literally broke in two on him at home in the closet. I just remember running my hand across the cover and feeling the grooves or "ripples". I had never seen anything to that point in my young bowling lifetime.

I hear you. I got mine right when the center that I frequented must have put out the contract shot because they got slicker and slicker each week and the Edge looked better and better. Than summer came and the Edge became a reddish turd. I put my hands in a friends black Hammer that fit pretty well, threw it, and the Edge was for sale within minutes.

And that my friends...is the rest...of the story. LOL

Loved that Mark X.  The difference in hit was noticeable from contemporaries.  However, After I fractured the third one, they wouldn't give me another...got an Orange Dot (poop!)

I have an undrilled Mark X...has ripples in the cover you can feel.  Also have an undrilled Orange Dot...I don't know why.

It's funny when I was still with Brunswick, abt 7 yrs or so ago, we had a rack with abt 12 on it and the covers ranged from perfect to abt as bad an olde mtn/gravel road...