1903A1 Trigger

[waco16]

I have a near mint 'parts gun' 1903A1 with pre war springfield C stock, 1505702 serial number and '39 dated barrel. I have been gradually replacing the parts fitted to it that were incorrect for the era, and pretty well there, but a little confused over which would be the correct trigger,
Should it be smooth or serrated?
Any help appreciated

[MAC702]

I think Springfield Armory used the serrated trigger up to 1940?

[togor]

Any service trigger can be considered correct since at the time of receiver and barrel manufacture there was no new rifle production just replacement during refurbishing.

[RCS]

This trigger would be correct as they started with the drawing numbers late in the 1930's, NM trigger has different number.

Actually, i have no idea where you find one with the drawing number