Hi from France,
I'm still there, not as often as I would like but...
I read your replies with interest and a real pleasure. I am happy that you found it is an interesting & nice guitar and happy to benefit from your precious help too.
Bugs:
>   
"...if you suspect that Harmony had a hand in the making of it check with these guys, they will be able to tell you as far as Harmony goes, I hope this helps:  http://216.219.212.85/cgi-bin/forums/ikonboard.cgi...
Thanks for your help and the link. I've tried to enter their forum but never succeeded: it would seem that my @ address is considered to be the adress of a spammer. 
>  
"...I am pretty sure that you can rule out Stella and Regal, I breifly checked them and didn't see any matches."
In one of his posts, Jeff told me about a Regal tiple he owns, whose binding is nearly identical: red & green and which has a wooden nut as well. I searched from my own and found some pics which show numerous "common points" (straight saddle, wooden nut, intricate colored binding) between a 1920's Regal tiple and my guitar :  
http://www.frets.com/FretsPages/Museum/ ... tiple.html. 
I also recently asked Chuck Fayne :  
http://www.fleamarketmusic.com/uke%2Dya ... search.asp   if he knew if Regal had made any guitars for Paul Summers and am waiting for a possible answer.
However, I believe that the 2 binding works are too similar to have been made by 2 different brands.With these informations, it seems to me that it is effectively an old Regal made guitar.
Thanks again.
Jeff :
>   
" Have you been playing it ? " 
- Yes, and it is a "régal" to play it (c'est un régal = french idiom which means : humm, it's delicious! ).The first thing which really surprises is the weight of this guitar : ultra light,  balsa wood ! Several times I re-opened the case to verify it was indeed inside. Tuners works fine, guitar stays tuned, no effort for the picking hand, the intonation is correct up to the third fret (when fingering with left hand is still possible) but beyond, the action is too high for fingers but nice for slide .
>  
 "How does it sound? "
- The guitar sounds nice ...the player has some practice to do !!  Seriously, it sounds very sweet but can be very powerful when you play harder, or strum it. I find it has a nice balance between bass, medium and high strings and the last ones are never "covered" by the others. The sound would be better with a new set of strings, it seems these ones are as old at least as the guitar! 
I mostly play with the guitar tuned DADF#AD or DGDGBD. I avoid GBDGBD because I'm afraid of an excessive tension on the neck.
It is very difficult to "describe" the sound of an instrument only with words, especially when it is not our own language. I can try to send you an mp3 file some day but ...please 
listen the guitar, not the player. I'm only playing slide since a year and a half.
>  
"If it wasn't what you were looking for,do please let me know,maybe we could work something out..."
 -So far, I keep it because it's a really good sounding and nice guitar to play and it looks beautiful, but if ..., one day...,who knows..., I promise that you will be the first person i'll make the deal with!
all the best
Gerald