PCB damage?

[danringer]

is this sort of stippling oxidation under the solder mask?
I don't have the board, debating purchase. But I see this on many 1980 Pac-man pcbs.

Thank you for your time and insight,
-Dan

 

[skate323k137]

Common artifact of the Wave Soldering process. Frequently seen in the 80s, i.e. the back of Apple II disk II cards.

 

[danringer]

Common artifact of the Wave Soldering process. Frequently seen in the 80s, i.e. the back of Apple II disk II cards.

thank you!

 

[Ape Cosplay]

I seem to find that only on US made boards. What's your experience guys?

[EDIT]
Typical of Midway boards, in Atari consoles, Apple, all american

 

[skate323k137]

Some obscure memory I recall the wave soldering process was declassified in/by the US in or after the 1950s. You can still have it done, including in China. I have a bootleg Prebillian PCB that IIRC shows these classic visual artifacts from the process, and I'm fairly sure it wasn't made state side.