The earliest correctly dated show I have found is 430715 (or 430717) Meeting The Terms of a Contract (Preston discovers a cave with goods in it)
Many dates from 1943 fall on Thursday, but the end of the show announces itself as being on Saturday. It is not clear what day these shows aired on or if they are rebroadcasts.
Notes for collecting this series.
1. All shows before 47-06-12 are 15 minutes or less in length. There is only 1 exception for an audition recording for December 23rd for either 1942 or 1943 depending on which log you look at.
2. Opening from the beginning of the series to around 48-09-08 to 48-09-15 is "The Challenge of the Yukon"
3. The opening changes between 48-09-08 and 48-09-15 to sounds of gunshots and "Now as gunshots echo..."
4. Around 50-02-17 the opening changes to sounds of wind and "Now as howling winds echo..."
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Design for Danger was really 440622 (334) Design For Murder.mp3
380203 (0001) Introducing Sgt Preston was a duplicate of 430819 (0290) Caught by a Button
38-02-10 0002 Bank Robbery aka The Bank at Dolby was 43-12-16 The Eleventh Hour
38-02-17 0003 The Will aka Prospect Creek was 43-12-23 Murder in ABCs
38-02-24 (0004) Five Aces (aka Murder at the Palace Cafe) was 43-12-02 (0305) Self-Defense or Murder
41-02-12 or 41-02-13 The Man in the Red Coat was 480913 The Fraud (This is a 30 min show so cannot be from 1941)
41-03-13 (163) To Have and To Hold was an episode of Lone Ranger
41-03-27 (165) The Case of the Torn Fur was The Case of the Orphan Dog (an 8 minute record)
41-04-03 (166) Deadfall was Case that Made Preston a Sergeant (an 8 minute record)
41-05-14 or 41-05-15 (172) The Doctor Takes a Case was 440106 Revenge In The Yukon
41/06/12 176 Blind Man's Bluff was 50/02/03 739 Blind Man's Bluff (30 min show)
41-11-12 198 The Wolf Pack is 440127 Wolf Pack
42-01-01 - 0205 - The Raid at Christmas Creek was 481203 The Sergeant's Right
It uses that title phrase at the very end of the story and it also says next Monday's show is titled "Timber."
42-02-28 (619) River Pirates was from 49-02-28
42-04-23 (or 42-04-24) The Will was really 43-12-23 Murder in ABC's
42-04-23 The Will was really 43-12-16 The Eleventh Hour
42-05-08 or 42-05-07 The Dawson Fire was 48-12-08 (stars Paul Sutton, Sponsor Quaker, Model Farm premium)