Can anyone give an approximate date on these 5000 foot numbers 552546 & 831204? Both reels are 4 screw, have black spools with red handle/white
knobs,I am thinking circa 1960s? I haven't received them yet, 552546 is arriving today.
You can probably get close by studying the information here.
https://lurelore.com/freds/abu.html#section1
Yes, like Tommy said. I would guess your reels are from the mid to late 50's, (maybe even the early 60's), since those are serial numbers, not lot numbers.
Thank you sirs !