I keep seeing "Vintage" on e-b and thinking "Stupid *ss that's a modern engine". Then I realise it's 40 years old!
That is what happened in the case I saw. It is for an AP Wasp .061 which are still being made and one can buy new from distributors. This one listed the RPMs at 3,000-14,800 so I looked at the MFG page and got the correct numbers. The listing also says it has dual ball bearings and that too is wrong.
As for the word vintage, it is overused, and almost always misused so I don't pay attention to it much either.
The reason I was asking about the practical has been answered now as well and I agree but the numbers Larry Renger has posted have been pretty short of 25K.
Thanks for all the replies guys!
Robert