As an energy producing device:  $0.

You're good with math Mark - spreadsheet what forces & energy would be involved ?!

You'll have to make some assumptions about the wheel mass & frictions & the cranks involved etc, but you should be able to come up with a ready reckoner for a few hours wheel demonstration at a constant rpm.

Then pass that over the other public demonstrations that Bessler did, including his very first one that was outside IIRC.

Then run the math for the demonstrations of his later bi-directional wheels that did external work for much longer periods.

If that still doesn't pique your curiosity than apply the same logic & rationale to the translocation test [stopped, shifted from one set of stands to anther & restarted] & finally the long duration test of 54 days under guard, lock & key, & from a second story room.

N.B. we all know that first principles say that OU/PM is not possible in the sense of a closed system self sustaining internally energy replenishing machine able to output external work.

The interest & mystery for many is HOW DID HE DO IT using the technology & materials of his time?

Were that by fraud, or, did he find a unique mechanism that was a 'work-around' of first principles [yes, I know this is heretical], or did he use some then unknown about or unexploited environmental force to do his bidding, in the guise of a 'true Perpetual Motion Machine' or 'Intrinsic Motion Machine' as he insisted his demonstrations should rightly be called.

Many have tried & failed to come up with a plausible fraud [untruth] option that could replicate his well documented demonstrations & the panel testing & close scrutiny by some of the best minds of the day in Europe, whilst outputting the same or similar levels of work & performance etc.

Good luck with the maid calculations !

Do you mean the mystery of the maid driving it by turning a crank in the next room?

If for instance someone with this lost knowledge wants to tell the world about this simple mechanism what will he get/earn from it?