ERNST LEITZ WETZLAR GMBH engraved on top of the topplate. Without plastic above the strap lugs to protect the body from scratches of the strap. Fully electronic Seiko shutter which was already used in the R4, TTL-metering and automatic exposure control (as in the later M7). Prototype of the later fully mechanical serial production Leica M6. May it will help you to choose the M6 you are looking for.
Since there are so many different models of one of the most popular Leica camera, we thought we could shed some light into this and list all variations known to us until today.
