parker bros made some fine , Quality SXS that CAN be worth some good change even today .
however the thing to remember is there were lots of companies that made knock off . i have look some that folks thought were made by Remington but on close inspection it actually said Remeington or Remingten.
Sometimes like with Manton they would add Bros after the name .
Again I would post your photos over on the double gun journal.
I would also recommend better photos as those fellas can tell you just by looks if the sxs is really a parker , who did the engraving , if any screws have been replaced . What looks to be original and what doesn’t ….. as well as a very good idea as to when it was made
They know their stuff and know it well