I want to get a .375 x 7 tooth rim and drum setup for my 61 Pro and the serial number plate is a little chewed up. Does 1984018881 sound logical? The numbers I'm not sure of are the 1 and 0. The 1 may just be a scratch, but 1984 sounds right for the year of this saw and I'm thinks it's the older style, but checking doesn't hurt. Here's a pic of the sprocket that's on it now.