Plug-in can HC-6/U HC-10 Quartz Crystal (one) CR-18 CR-23 CR32 radio cb IF etc

Description

Flat shipping regardless of quantity!
These are used plug-in can type crystals in the HC-6/U and HC-10/U cases.  These are the plug-in type crystals with .050" pins and 1/2" pin spacing.  The HC-10 is a shorter case that was common in "compact" (for the day) mobile and VHF gear but fits the same socket as the HC-6.
Everything in this list an HC-6/U case, unless marked as "HC-10" in the list. The second picture shows an example of one for comparison.
Pictures are representative, not exhaustive.  There will likely be some dust, signal-corps stamps, etc. on the case, as is typical of this stuff.  Everything is structurally sound and tested for oscillation.  The whole point is the keep this old stuff working, right?
Testing was done with a homemade tester that is ~35pF load capacitance in a parallel-resonant fundamental circuit, and if the crystal was close it was good.  These things are old and were specified for various circuit parameters and tolerances for which I don't have the original specs to test more exactly.  While the crystals are labelled for 6 or more significant figures, this is really not a 6 figure world.  My tester is a fundamental-mode circuit, so 3rd-overtone crystals oscillate on their fundamental (and if they did this I counted it as testing "good").  Where possible I've included a crystal designator and/or manufacturer after the frequency in the list to help you along (e.g., a CR-18 is fundamental oscillation/parallel resonant, CR-23 is overtone/parallel resonant, CR-32 is overtone/series resonant, etc.).  When the standard CR-xx markings weren't present I indicate 3rd-overtone crystals with the "3OT" designation in the list.
My ebay store has a "Crystals" section where are sorted by frequency range if you want to browse around.  If you have other questions related to the listing, feel free to ask and I will try to get back to you in a timely manner.