Stone , I would be personally curious to know if the 25 no dash is indeed a 4 screw gun , and the serial # range.
It should be in the S190xxx to S205xxx range.
In my estimation, a very desirable gun.
Condition is extremely important, check the bore carefully with a good light source for any telltale rings or bulges. Work the double action and make sure the cylinder clicks into place well before the hammer drops on each chamber (timing(.
Take your time , go over it thoroughly in good light. Any deficiencies found can be brought to the attention of the seller and used as bargaining to negotiate a better price
.
Good luck ,,keep us posted ,,AL