Ultra rare R15 cardridge made by Neumann-Gefell Co. around 1953. Neumann R15 historic cardridge for turntables The only information you find about this unique cardridge is if you type radiomuseum tonabnehmer r15 at googleNeumann-Gefell mentions is in their time-lineas well. No other information can be found. Founded by Georg Neumann, Microtech Gefell was originally known as Georg Neumann & Company Gefell.Gefell is the name of the town to which Georg Neumann fled from Berlin in 1943.More info can be found at the Neumann-Gefell wikipedia site.Today the name Neumann-Gefell is mainly known for their outstanding measuring microphones, tube-microphoneslike the UM57 the CMV536 and their condenser microphone capsules like the M7, M8, M9, M55k and others. I suspect that the number of existing cardridges of this typeis under 5 pieces. I never saw any other pick-up built like this.It can be a treasure for a historic cardridge and phono collectionand I also really would like to listen to the sound it produces. The R15 has not been cleaned before offering it because Ido not want to destroy anything and rather leave it in theoriginal condition. Please see the microscopic photo to judge the condition of the diamond. Shipping with higher insurance. I am experienced with international shipping and pack very well. Untested historic item sold without any guarantee or the right to return the item.