Balls from the 50's.
I would like to see how a 240 average bowling would do with a ball from the 50's like a Manhattan Rubber.  Even with the more lively pins and much easier lane conditions the scores would reduced by at least 15%.
I have a 16# undrilled if someone is interested.
text: 4696824175 or message me here

Fwiw, I believe Valenta won a regional on Cheetah last year using rubber. So it IS still useful, for the right bowler on the right condition.

I bowled with rubber & plastic and I remember events where scores were very high...so this is a fallacy

Yea, but you will probably bowling on a high friction surface (wood).

 Once shot over 1000 for a four game set using one, and that was after shooting a 190 the first game before switching to it, then shooting over 800 for the back three.

 Give me one, and enough friction.  Everything has its place!

I sincerely hope you are joking about that price tag?

I remember I had a lady come into my shop almost 20 yrs ago with a wooden bowling ball wanting $4k for it...she said it was rare...I said well there's 2 in this shop with yours and mine...she put on eBay and abt a week later her husband traded it for a plastic ball...
So it's only worth what someone will pay...

I have an undrilled green messenger. I'd take 250 too