this 1911 Oldsmobile Limited Series 27 was estimated to sell for $2 million, but it went for a whopping $5 million

https://gmauthority.com/blog/2025/09/this-1911-oldsmobile-just-sold-for-a-staggering-5-million/

the Mother in Law seat, there were a couple versions, but they mostly were exposed to the weather and not equipped to keep someone seated in an emergency braking event

This simply takes top honors for the the most spiteful mother in law seat ever made! A 1910 Welch

There was this variety that slid out from the side, and I've seen it on the Kissel and and the Paige Model 6-55 Daytona Speedster

and there was this flip lid on this 1911 Olds Autocrat

https://justacarguy.blogspot.com/2017/08/1911-olds-autocrat-has-cool-rumble-seat.html

the 1910 Matheson had one mounted to the spare tire /5th wheel

Paige Model 6-55 Daytona Speedster with mother in law seat

and the 1920 Kissel Gold Bug I posted back in 2013

https://justacarguy.blogspot.com/2013/04/1920-kissel-gold-bug-roadster.html

https://fornoob.com/the-mother-in-law-seat/

1911 Oldsmobile Limited, series 27 / limousine, biggest tires ever factory installed on a car

The fine print in the above ID card tell us that this is the only one left in existance, and that the tires are 43". This wasn't the only car with tires this size, but you aren't likely to find another unless you come here to San Diego and see the 1910 Hunt Special with 43X5" tires http://justacarguy.blogspot.com/2010/08/happy-centennial-birthday-hunt-special.html