This watch, #20708 999E was recently listed on eBay.

Given Bill Kapp's research on these watches Ball & Co Movement Number Listings where it states that barrel bridge 20708 was seen on #90403 eBay, I asked the seller to remove the Bbl bridge to see if the numbers matched.

Watch #20708 does in fact have matching Bbl bridge 20708 on it, he provided a picture, so, there is an error in Bill's research. [ERROR CORRECTED PLEASE REPORT ANY OTHERS YOU FIND =LVR]

Seller pulled the listing during this process but said he was conflicted about selling it anyway.