There are a couple of holes there for a reflector (at least on my '70).
They seemed to be too much so I have removed mine.
Adam Bradley wrote:
> Clean '69 in need of mechanical repair on eBay:
> This is the first time I've seen one like this, though:
> '70 1600 SPL311-28181
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Dana Nojima, Ph.D.
Cell Biology Group
675 Almanor Ave.
Sunnyvale, CA 94086
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