W&D trench watch help

[Kieran]

Hello,

I recently serviced a W&D 1915 trench watch and to my horror discovered that the balance staff was worn, this meant that the watch would run dial down but not in any other orientation. 

I believe it is a  BTCo (Damas) movement but not sure on caliber.

If anyone can identify the movement and calibre and knows where spares can be sourced I'd be very grateful. Alternatively if anyone can suggest a replacement period correct movement that would be brilliant.

Thank you

Kieran

[rodabod]

The arrow underneath the regulator makes me initially think “AS”. Have a look at the lower caliber numbers on Ranfft 

[jdm]

On 5/4/2021 at 3:15 PM, Kieran said:

I recently serviced a W&D 1915 trench watch and to my horror discovered that the balance staff was worn, this meant that the watch would run dial down but not in any other orientation. 

Have a look below, if not sure of the make search by size.

https://www.balancestaffs.com/btc.php