(https://imgur.com/gallery/1-0-senator-assembly-numbers-9q9glcW)
I was taking apart a 1/0 Senator i got on eBay and noticed the number 2 on spool and both side plates. I haven't seen numbers inside my other senators. Did Penn use assembly numbers or maybe the previous owner marked it for some reason?
https://imgur.com/gallery/9q9glcW#4PX3WPO