Nick Stroebel’s reference book Old Gunsights - A Collector’s Guide, 1850-1965 notes the following regarding the Lyman 17A series front globe sight on page 57,

XNA
Springfield Model 1903 .30 caliber (fits
Military dovetail band-0.775 inch tall);
Springfield 03A3 (with Lyman dovetail
band No. 03A3

Jay