This will be an interesting thread, and I'll be interested to hear the replies. I won't wade in too much myself because, although I'm an avid collector, I've never really been sure about the 24hr watches - the Franken's are more abundant than the real ones, which makes it hard to collect a reliable base for comparison!
But I will comment briefly on movement numbers. 2609HA is the "base movement" for all the modern Raketa movements (except the 2209 and the quartzes), but I've never heard of 2626 (that would be 26mm, automatic, date but no day). But between 2609HA, 2610, 2614, 2628, 2623 and 2627 the bridges are interchangeable. As mentioned on another thread here, bridges don't break, so a "repair" with the wrong bridge is unlikely; a 24 hr watch with the "wrong" bridge must either have left the factory that way, or is a franken.
I would guess that the only thing necessary to convert 2609HA to 2623 would be the exchange of a couple of gears (with a different ratio). I would not be surprised if there's a good trade in "conversion kits" for frankenmeisters.
But I will comment briefly on movement numbers. 2609HA is the "base movement" for all the modern Raketa movements (except the 2209 and the quartzes), but I've never heard of 2626 (that would be 26mm, automatic, date but no day). But between 2609HA, 2610, 2614, 2628, 2623 and 2627 the bridges are interchangeable. As mentioned on another thread here, bridges don't break, so a "repair" with the wrong bridge is unlikely; a 24 hr watch with the "wrong" bridge must either have left the factory that way, or is a franken.
I would guess that the only thing necessary to convert 2609HA to 2623 would be the exchange of a couple of gears (with a different ratio). I would not be surprised if there's a good trade in "conversion kits" for frankenmeisters.
