I am working on a large 8-day all-the-bells-n-whistles cuckoo clock. It has a Regula 34 with the M date code. It is not from 2020, thus leaving either 1980 or 2000. Based on the style in the images below, do you think it is closer to 1980 or 2000? Thanks!
Cold war era Regula movements were signed 'Western Germany'. This one says 'Made in Germany' so I am inclined to say it was made in 2000.
The carvings and detailing are also in line with higher-end cuckoos made during recent years: a lot of cuckoos from the 1960's to 1980's were plainer.
The gong hammer in your photo is obscuring the area where "SYNTH OIL" was stamped on movements after about 1990. This is the later style movement that has the actuator wheel pressed on the shaft other than mounted with a setscrew. Still, an 8-day movement with animation is pretty special. My guess is 1980, not 2000.
The movement does state "Made in Germany" as opposed to "W. Germany". The cuckoo bird is made of wood. "SYNTH OIL" is stated on the movement on the left side (it is not blocked by the hammer, but it is faint). The star wheel is pressed on - and I replaced it after cleaning with one with a set screw. The flutes were glued to the sides, but I didn't have to remove them to get the movement out - since case is so big. More images below.
That looks like a fun clock to work on! I like the details on the dancers, and it's good to see a wooden bird and know it has wooden weights. The SYNTH OIL stamp would suggest post-1990-ish, so based on that, I concur with Willie regarding its build date.