8ga. Parker ?

[B. Dudley]

Yes, TPS would be the source for production numbers and such on any rare configuration guns.
To address a little bit of trivia. The longest barrel length on the 8ga (or any ga for that matter) was 40”. I personally restored a 40” 8g a couple years ago. The actual barrel measurement was 40.5” and the barrels alone weighed 12-1/2 lbs. the gun in total weighing in at 16-1/2 lbs. it was a hammerless gun with an un-matted rib, likely because the matting machine could not handle the 40” length. I have not seen another 40” gun yet to confirm.
I speculate in saying that the most common barrel length in 8g guns as a whole was 36”.

The hammer 8g guns were built on frames as large as number 7 size. And the hammerless guns were built on up to 6 frame size. Some 10g guns were also built on the large 8g number 6 frame.