Sorry,I'm late here...after rading some coments at the WAF I'm a little bewildered. Meybauer,not a legit screwback.......Gentlemen,please compare the core here with a regular,common "Deumer" without a "blob".That's all-In my opinion Nan Sus Screwback EK is a typical,textbook clamshell EK made by "Deumer.Of course this is the "regular" size for the TR EKs,but there's also a "Schinkel" variation! I would take this one in a second-for me a good,clean clamshell EK made by Deumer in excellent condition! Just my two cents... Micha