Perhaps I should add this to the collection of avionic photos
Works as either a COM or a NAV. Love it!
Your number 5, solves 8.33khz spacing or any subsequent upgrades: you can tune continuous Frequencies (like old AM/FM bands radios )
…or like modern HF radios.
I should mention that both those radios are exhibited at the aviation museum at Stockholm Arlanda Airport.
It’s quite as small museum but packed to the gunnels with interesting exhibits, the museum is easily accessed from the terminal by taking the free airport bus to the Radison Blue hotel then a short walk.
With an entry fee of €5 it represents superb value for money, check the museum website for the opening hours.