Ged
Thank you for the key it is proving to be a welcome addition to my collect. I believe I have now determined the sec ref number for the standard clock key used in the RAF.

21B/791 Keys, winding

My last posting says I believe I have located the standard key used in the RAF for winding clocks.
For the record I have located an image of various keys used in the RAF for other stated purposes.
These keys are used in adjusting navigation systems.

Hello Ged, can you please contact me to discuss the RAF MK I clock types please. I have two. Robert in Hampshire.