After shooting and handling my pre-war (1920) Officer's Model .38, and my 1917 revolvers (see earlier threads "perfect pair" for pix), I noticed that both have a dished out area milled out of the top strap in front of the forcing cone. (On most revolvers this is the area where "gas-cutting" occurs.) I never knew about it because I never owned early pre-war Colt revolvers before. Does anyone know why they dished out this area? My later Colt revolvers don't have it. I assume that like P&R on Smiths, this feature was eliminated to cut costs. Thanks for any info!