Just looking at the database at the
Hacker Radio Yahoo group, the latest RP25 with a Celestion loudspeaker is 39539. The earliest RP25A that we have on record is 41793. So there is a reasonable overlap where Celestion speakers could have been fitted. The earliest RP25 we know about is 01063, so the vast majority of non-A models would have been fitted with the Goodmans. No bolts on either Celestion - they were only present on the Goodmans units fitted to the earlier RP25. The order went like this:
1. Goodmans with bolts
2. Goodmans sans bolts
3. Celestion with silver frame
4. Celestion with black frame (and doping compound on the surround)
The changes in loudspeakers seem fairly random with no attempt to synchronise them with a model change. And of course, loudspeakers get replaced in service. And alternatives might have been used in production because of shortages.
The Sovereign II itself had these main generations:
1. Original RP25 with germanium AM tuner
2. RP25 with silicon AM tuner
3. RP25A with revised FM tuner (with clear plastic cover)
4. RP25B with revised FM IF PCB (uses an IC)
There were several other details changes, like the addition of a DC input jack, changes in handles, etc. But overall, the model has a somewhat simpler history than the Hunter:
http://www.vintage-radio.net/forum/s...d.php?p=922240
So, what is the serial number (and colour) of your RP25? And is frame of your Celestion loudspeaker silver or black? These details will help answer the question about originality, and also we could add your set to our database at the same time.
Mark