IIRC the Tower '45' had the Nikkor 2.0/50mm lens fitted, while the Tower '46' had the Nikkor 1.4/50mm lens. Both bodies were identical: lever-wind, flip-up back door, ratcheting, up-counting frame counter, 1/25th synced.
Think I'll dub my newly-acquired Tower a type '44', since I'm buying one without the lens! 😛 But, it will have the Canon 2.8/28mm and the W-Nikkor 1.8/35mm and a Voigtländer minifinder so I guess we'll be fine...😎
Selling my chrome wartime Leica II off shortly to partially cover for the expenses. Oh well.