Your P38 sounds like what we call a CZ46. They were made in Czechoslovakiaicon in 1946 and usually have an E and Lion on the left trigger guard..and, a '46' on the right trigger guard.

3000 were made up from parts at that time. Later, many ended up in the DDR for some reason?

The rampant lion on the top of the chamber is another indication. Often, the slide will have an 'S' stamped somewhere near the safety.

The SN on the slide is usually under the 'P.38' stamp.

Orv