The reference to "Stroud Berlin" is puzzling, the Stroud Piano Co. was in Stroud, and it is an unlikely name to appear on a Berlin-made piano, but they made the "Berlin Model". There was also Stroud, New York. I presume the reference to the Pianola Co. is because it is a pianola? The number doesn't help because we don't know whose number it is.
If it is a Berlin piano, and your tuner thinks it is safe to remove the action, it may be marked on the back with the action makers' name and number, and I may be able to date this.
Can you tell me how many of the top notes have 4 strings?
The whole of the top 1/3 of the keys are 4 string. The rest are standard 1,2 and then 3.
It was not a pianola so the brass name is unusual. I’ll figure out how to post some pictures
But there is no record of any makers experimenting with a four string or even any idea why they would have done it, considering there is no advantage.
I’ve added some more photos, fingers crossed it works properly this time! Included is a picture of what I think is the serial number showing the 4 strings. Unfortunately we didn’t take the action off although perhaps we can do that in the next tuning.
This is much older, looks like Edwardian. There are always experimental ideas which don't necessarily succeed. I can only guess that The Pianola Company sold the piano.
If 10690 was a Stroud serial number it would suggest 1920, but the piano looks more like 1902.