Re: ID This Device?
Yes, Lawrence, a good guess! I've had a quick look thru Wireless for the Warrior Compendium 1, which covers the Spark to Larkspur era and I cannot see anything that resembles the crystal. Most of the post-WW1 sets had master oscillators and only the later WS No 1 and 3 onwards had crystal oscillators as an option.
If it is marine band, then a pre-WW2 list of ship working frequencies might show the crystal as being for a ship TX. I have some data on that subject, if I can find it!
Cheers
Roger
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