No I haven't, from what ive found so far it seems like the numbers by the cutout indicate weight / number made.
Found another 1928 like mine and our numbers are close.
469 / 173
488 / 151
From what ive gathered so far taking with Josh at the fisher museum.
The earliest know fisher blacker is 1920 & latest 1935.
Based off sn# Fisher didn't make many, less than 200 by 1928.
So guessing maybe less than 500 total.
Still looking for more dates and numbers.