Writing as a longtime Fisher user but new to the forum. I have a grandpa bear model which was purchased in 1979 and still remains our primary source of heat. It has all black doors, silver spring handles and exhausts from the top. Doors have the three pine trees on each side, the Fisher name evenly divided, a circled R on the right door, Patent on the left door and Pend on the right. Only other marking is a serial number stamped on the back...5332178. I would appreciate any further insight and history about this stove. Art PS.....great site with an amazing amount of information!