Interesting old watch, 21J 7AP movement stamped with a X, 42-51 BB catalog lists a X2120 crystal that will fit it, 21.2mm X 17.7mm flat bezel named Time King "A"
Mmmm I posted this one a couple of weeks ago.
HMMM... Then it's almost certainly either the "Time King A..." (Or less likely the "Broadcaster!?" Which I suspect is then a 17J model???) The 1939 "Time King" I ID'd, is also a 21J !
Then I show the following crystal specs. for the two models:
MODEL
GS
SUC
BB
Broadcaster, Time King "A"
1
CMX324-1
RMS124-15
2
CMX2120 178
Best :-) Scott
In reply to I wonder if the one that by OldTicker
Greg,
Well the next "Broadcaster" looks akin to an AVIATOR or STAMFORD esque (Tonneau shaped) case... and the prior (21J) Time King shared the same case as the (17J?) Broadcaster (i.e. wear the same glass+) so I would wager that to be the case... (Punn intended...)
:-) Scott