NOS. I removed it from the bag to determine the size which is 1 x 24 (English). Not sure of the vintage but I think it may be a later version. Silver alloy finish, very nice seals and super smooth needle bearings. Not sure of the stack height but I'm sure that info is available online. I understand these have been out of production for awhile. Asking $50. plus shipping(CONUS only). Thanks.