Question FSR/FST serial number location?

[steinbil]

Quick (stupid?) question:
On my APEKS DS4s the serial is printed on the outside of the reg body. Where can I find the serial on a FSR and a FST reg?

Also: what about seconds. Is the serial number printed on the XTX line of regs?

 

[gratefulmjc]

Here are pics of two FSR 1st stages (two pics because the location of the Serial Number moved sometime between 2011 and 2023). One made in Aug 2011 (1108 0642) and the other in Jan 2023 (2301 00061).

Also, here are pics of an XTX50 2nd and the box it came in. As you can see from the Serial Number in pics (221104293), it was made in Nov 2022...and the box further states on the 28th of Nov.

(FWIW, the Serial Number is YYMM###### where YY is the year and MM is the month.)

 

[steinbil]

Thanks! I recognize that CE marking on the seconds, I just missed the serial. And I have the newer FSR, it makes sense that it's hidden beneath the DIN port considering I haven't noticed it at all previously.