View attachment 736577From the white mark going right for 15 drive links it’s .050 and non safety. From the green mark going left they’re .063 and safety chain. ?
Chains are made up from components (cutters, drive links, rivets) and these can be recombined in a number of creative ways.
It is possible, but rare, for a mainstream manufacturer to mix them up (although they have dozens and dozens of different little pieces to track), or get them in the wrong order. But anyone with a spinner and breaker (or the equivalent) can mess up, or just not care.
https://www.arboristsite.com/community/threads/spinning-chain-fess-up.170216/
I once traded some used chains to a fellow A.S. member not realizing that half of some loops were low kickback ('safety') and half were standard drive links. He kindly pointed it out.
I have bought a number of '
once used never sharpened' or new old stock (NOS) off eBay. One 'new' loop I mounted backwards on the bar. Only slightly embarrassed (everyone has done it, right?), I took off the bar, flipped the chain, and remounted it: still backwards!!! Upon inspection, about 12 - 16 drive links of chain had been spun in the opposite direction. Probably why the chain had been put back on the shelf, and sold as NOS when the eBay seller bought out the dealership!
Some people just do not care about mixed components. I have seen many different brands of cutters mixed on the same loops, 3/8 low profile tie straps used on on full sized 3/8 chain, and my favorite: the Pop rivet!
Philbert