The dark green slots and "Apple Computer Inc. 1978" in the middle, tells me it's revision 4 board. If you look closely there might be text "REV 4" under one slot in the middle (closer to CPU) or under the CPU if you lift it.

I have the same revision board on my Apple II+ (8011) -> http://68kmla.org/forums/viewtopic.php?f=3&t=20388&start=25#p199691

If my memory serves me any good, it's about 1980-1981 production cycle.

What codes the ROM chips have? (the bigger chips in the middle of the board).

341-0001-00 II+ Integer BASIC E0

341-0002-00 II+ Integer BASIC E8

341-0003-00 II+ Integer BASIC F0

341-0004-00 II+ Integer BASIC F8 (Old Monitor ROM)

341-0011-D0 II+ Applesoft BASIC D0

341-0012-D8 II+ Applesoft BASIC D8

341-0013-E0 II+ Applesoft BASIC E0

341-0014-E8 II+ Applesoft BASIC E8

341-0015-F0 II+ Applesoft BASIC F0