It had no meter but had an automatic diaphragm and instant return mirror.
Martin & Co begins using one set of serial numbers for guitars and mandolins. only through your purchases can educational pages like this one remain possible.
So, if your serial number is 240121 for example then your Martin guitar was built in 1968.
The number is above 230095 so it was built after 1967 but it’s less than 241925 so it was built before the end of 1968 – so it was built in 1968.
As I collect things at estate sales and garage sales I am troubled at times about how quickly people are forgotten sometimes.
Thankfully, Fred Gerlach appears to be fondly remembered by many and his music will live on.