1903A1 Trigger

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

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

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.

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 noAttachment 137082Attachment 137083 idea where you find one with the drawing number