I would almost bet that 7611 is the 11th week of 1976 and there for a
date code.



Jonathan Goodish wrote:

On the body of the switch there are three lines, the first being the
serial number. The lines read as follows:

10-357xxxx-1
B
7611

I don't know whether the "7611" is the date code or whether it's
something else. Can anyone help?

Thanks,
JKG