I have available for sale a Metz 45 CT1 Serial No: 535865.
A recent check with the Metz Support Service indicates that this flash can be used with modern dslr’s,
I checked regarding my Pentax K20d. The critical serial no would appear to be 534000.
Any 45CT1 with a serial no lower than this should not be used because of high voltage trigger circuit.
Please PM any interest , questions and/or offers.