[Yosemite Sam]

Without getting into a whole big thing about the "why" I need to find out what the difference is between the serial numbers on the 1650's.

Apparently the 1650's have at least 3 different kind codes:

0067

0070 listed as a "1650 model 856"

and an 0670 that is listed as a "1650 (hvc)"

Can anyone shed any light on these differences?

What is a "1650 model 856"?

What does the "hvc" stand for?

On a side note, I also have a 1650 that has no "U" in the serial number, anyone know what's up with that?