[Sustain center block on late 70s ES-355]

Hello, just a quick question, what wood is the sustain center block on a late 70s ES-355 (when they had maple necks)? And has that ever change? 

[Epiphone guitars with maple necks (not fretboards)]

Thanks for the info.

[Epiphone guitars with maple necks (not fretboards)]

Hey, besides the Epi Zakk Wylde bullseye model what other Epiphone has a maple neck with rosewood or ebony fingerboard? 

[Is this a real ES-355 Studio?]

Well to not bored with with the details after a looong ride to go and check it out I didn't come back with it 😞

[Is this a real ES-355 Studio?]

This guitar is listed locally and I'm no ES-335 expert to know more about it. I didn't even know there where 335 without F-Holes but after a quick search now I know some models come like that. Doing a serial number search it comes out to be from:
Production year: 26 October 1989 (serial nr.: 565)
For what I can find online looks to be legit but has been modded for the Bigby and they changed the pickups. So, is this correct?