I have an early .38 Regulation Police (S/N 194, April 1917) with a large logo on the sideplate:
An equally early .32 RP (S/N 259152, May 1917) has no logo on either side of the frame.
This reprocessed .22/32 HFT (S/N 364316, October 1921) has both the small logo on the left side and the single-line address mark on the right-- but this gun was modified at the factory in 1946 and may have been re-marked when it was rebuilt as a Kit Gun and refinished.
A .38 M&P from March of 1922 (S/N 400078) has the small logo on the left and no address line on the right. I won't bother with pics because we are pretty far away from WWI by this time.