Altair 680B Toggle Switch Style?

[Bill Richman]

I tried to post this once before, but I never saw that it showed up, so here goes again...  I'm trying to build a replica of a 680B using a real 680B case from eBay, authentic switches and LEDs, and a power supply and CPU board of my own design.  I've seen both flat- and round-handled toggles in pictures on the web and my old issues of Byte magazine, and have been unable to discern a pattern to it.  Can anyone on the list tell me why the difference, and which one is more accurate to use?  Thanks.