3 Vintage Hewlett-Packard Black Knobs for 230A Signal Generator or Tube Amp

Description

Up for sale here is this set of 3 lightly used vintage black knobs, from the 1960s and Made in USA.  These are from a HP/Boonton 230A signal generator originally.  They are in great shape, with just light wear.  Each knob is for a standard 1/4" round shaft, locking on with two set screws.  One knob is missing one set screw, but will lock on fine with just the one.  This listing is not for ALL the knobs on the HP 230A, just the three seen here.  Please see my pictures for details and dimensions.
US shipping and handling is , and international is , no matter what quantity you buy.  All my small parts are set up for combined shipping, so you can just use the "add to cart" feature and then check out at once to get discounted shipping.  If you have any questions, please ask.
I have more vintage switches and other vintage electronics listed--feel free to take a look!