Hello Phillip and welcome!
The byf 42 means the receiver was made by Mauser (byf) and the 42 equals the year, 1942.
E/135 is correct, the barrel is a replacement, but interesting as it is a B'O'HLER STAHL replacement, if you do a search for BO or Stahl, you will find some discussions on this topic.
In 1942 (last year of official production), there were 113,000 Lugers made, so if yours does not have a suffix immediatly after or below the serial number, then I believe this one was made at the beginning of the year. (Not all followed this pattern, many serial numbers might have started in the "f" suffix range or whatever suffix letter they were in when the year started).
Any pictures you can post on it, esp showing the Stahl markings?
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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