When you have a single letter followed by four digits, the number doesn't mean anything in regards to the date of manufacture. It's only on modern decks that the four digits BEFORE the letter give you the week and month of manufacture. As the letters repeat approximately once every two decades, you need to use other clues to determine a deck's age beyond that. Design of pips, design of courts, index size, tax stamp (if the deck's tuck box is reasonably intact) including the cancellation stamp on it - those are some of the main cues you'd use.
Your Steamboats have some cues - the use of the steamboat joker rather than one of the more politically-incorrect designs is a clue, as is the mention of USPC printing the deck at the "Russell & Morgan Factories." That title used on an Ace of Spades was common for USPC between 1894 and 1925. That narrows it down to the first two possibilities, 1904 and 1925. Since I think they were still using the racist joker in 1904, the better guess would be 1925 - though I could be wrong. A little quick research didn't yield any results on how long those jokers were being used.
For the bottom deck, the mention of "Consolidated Doughtery Card Co., Inc." is a big cue. While both companies, Andrew Doughtery and New York Consildated, were owned by USPC, they were operated independently. USPC combined them into Consolidated Doughtery in 1930, and in 1962 absorbed the company into its own operations - that limits your deck to either 1941 or 1961.