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Identifying 1980s vintage PCB solder mask/surface finish?

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Identifying 1980s vintage PCB solder mask/surface finish? | 9 September, 2017

Any idea what kind of surface finish this early 1980s PCB had? It's kind of grainy/textured. My guess is this is a CEM-3 board (the laminate appears to be white-ish which is common to CEM-3). Originally made by Elec Eltek, E3330B material. I asked them but received no reply.

https://i.imgur.com/QJRoIfN.jpg

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