This is quite unusual. Reference is 22366. The super compressor and diving helmet is a first for me ... Date is 08/1959
That is unusual. What does a reference 22366 reference look like? As I understand it, the super compressor and diving helmet is the trademark of the EPSA Super Compressor case. http://scubawatch.org/EPSA_SC_FAQ.html Interesting that the first generation Polerouter Sub, not produced until 1960, does not include the trademark within the super-compressor case back.