[Elecraft] K2 question

[Christophe F8ACF-56]

hello list,

it says this on page 54 of the book 

" The bag filter crystals of 7 Should Have a number written on it.
Record the number here: ___________. (This identified the tested
frequency of the crystals, and can be used in aligning filters."

on my bag is registered 4.913MHZ, have I understood correctly?

  thank you for your help, even if the child seems to question you, that I avoid misunderstanding and try to lead my K2 to good success.

73 F8ACF K2 # 7369