Hello, so I found this Bass Clarinet on eBay. http://www.ebay.com/itm/351923219343 Click the picture in the listing and scroll down to see more photos. I've done some research on these. Somewhere on this forums or elsewhere, I've read that there were wrongly stamped Buffet Crampon basses that stamped "Evette and Schaefer" and became the "Master Model"? This paticular one on eBay does NOT have the words "Master Model" above the initial stamping. All it reads is "Evette and Schaefer Paris France" and then "Modele Buffet Crampon" on the bottom. From what I've also learned there were several types of Buffet Crampon basses, the E11s, E12s, E13s, R11s, R12s and the R13s. What are the differences between the E series and the R series? The thing that is hard for me to understand is the serial. Seller says the serial is "1943". Is that possible? I cannot find that serial data anywhere. The Buffet Crampons that I see online all have a letter Prefix before the numbers, this one does not. I do not know how old this is. Anyone know this paticular model with THAT stamping or are any features recognizable? Is this a professional or student model?