Schubert DW
Bought on a flea market in Antwerp. My first pinwheel calculator. D appears to denote the size of the machine (with 6 input sliders they are C), whereas the W stands for the model without one-hand operation (with are denoted V), and without backtransfer (R) The Schubert range at the time consisted of DRV/DW and CRV/CW.
