Originally Posted by
majmt
An off-topic question re early CA Masis. In addition to the serial number and size stamping on the bottom bracket, I noticed +CF+ stamped next the M cut-out. Anyone know what that means?
it is actually +GF+
The casting house Georg Fischer
Still in business. I do not think they do bike components any more.
Depending on the depth in the casting and the amount of file effort, it goes from fully visible to missing.