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Are you talking about the belt from the motor to the countershaft or the belt from the countershaft to the spindle?

If the countershaft assembly is mounted to the bench separately from the lathe, then the flat belt size would depend on where the countershaft is mounted.

I'm guessing here since I haven't seen a 1925 9", but based on many of the countershaft assemblies that SB used, the motor mounts directly to the countershaft? In that case the v-belt length will be fixed. If you have pulleys with two grooves on the motor and two flats on the countershaft, I believe the v-belt should work in both locations without changing the length or using a tensioner. The image in my head is based off of my 10K with horizontal drive.

In any case, if you get a seamstress tape measure (tailor's tape) you can directly measure the flat belt size from the countershaft to the spindle.

For the v-belt from the motor to the countershaft, I would suggest using a piece of 1/2" diameter rope wrapped around the pulleys, mark the rope then lay it out flat for a measurement. OR. if you have an old belt from something else that is longer, cut the belt and then wrap it around the pulleys, mark and measure. I am pretty confident that the v-belt will be an "A" series which means that it is 1/2" wide on the top of the belt. It should fit entirely into the groove of the motor pulley. Ideally it does not stick up above the groove nor should it bottom out in the bottom of the Vee. This assures that the belt sides make complete contact with the pulley.

The motors were most likely only 1/4 to 1/2 HP on those early lathes, but I have no direct knowledge of that.

The oldest documentation I have is a catalog from 1966. There were lots of different motor options in that catalog.

Have you looked on the vintagemachinery.org web site?

If you would like, I can take some screen shots of that catalog and email them directly to you, in case that might help.

Would that be an "O" series lathe in 1925?

Stuart