Just a guess, but maybe a common interplane freq.? (126.18 MHz), or maybe on HF using the fundamental.  If for VHF, it would follow there be an equally common receiver mixer crystal.

I have a bunch of them around, and 7010 is quite common here as well.

Scott W7SVJ

From: [email protected] <[email protected]> On Behalf Of Doran Platt
Sent: Thursday, April 28, 2022 4:41 PM
To: [email protected]
Subject: [MRCA] Trivia Question

With your kind indulgence,  I ask the following:

Why do we find a proliferation of surplus CR-1-A crystals cut for 7010 kHz?

K3HVG