[Milsurplus] WWII Crystal Confusion

[Alan Tasker]

WWII era crystals.

Crystal Clear? No, crystal confusion.

A friend of mine has two crystals that look very similar to each other. 
They are, I think, FT-241 style, that is, they have a wider pin spacing 
than the FT-243 as used in the BC-611. (Just to verify all common holder 
types, later crystals were in HC-6 holders for PRC-6, HC-25 for PRC-6/6) 
N'est pas?

In any event, one crystal has the following marking,

Channel 386
38.6 MHz

The other as follows,

Channel 36
23.6 MHz

The questions are....

1.- The BC-604/684 transmitters used crystals like this I think. If so, 
what is the Multiplication factor?

2.- The BC-603/683 Rx were tunable, no crystals?

3.- What crystals and markings and multiplication factors were used with 
the BC-620/659/1335?

4.- What were the likely radios that his two crystal would be for?

Thank you.