[Hammarlund] HQ-170 what rev?

[Chuck Oliveira]

I have a HQ-170 in excellent cosmetic shape.  It needs work though.
There is no clock, but a blank slot for a clock.  It has a serial number
on the back #1384.
 
I see references to different rev A or B of the schematic.  Any idea
what I should order?  If I have a rev A, is it worth bringing up to rev
B?
 
Thanks
 
Chuck 
WA1RCH