[ Ref. 220124 MMD, Unknown Tune on Unusual 3-tune Thorens Music Box ]

Greetings MMDers, I am currently restoring the curious musical box
I previously posted about. Thanks to the multiple people who emailed
me telling me the tune was 'Ben Bolt'.

Upon beginning the restoration process I found markings [image links
below]. I was wondering if anybody had any idea on what these markings
mean. A date code of sorts? A serial number?

I have never seen this before on another box but I haven't restored
many either. Any suggestions will be helpful.

Thanks,
Peter Thorp

 [ https://www.mmdigest.com/Attachments/22/07/28/220728_102324_68230A79-1762-4814-94DA-A90C2A9E4D43.jpeg 
 [ https://www.mmdigest.com/Attachments/22/07/28/220728_102324_02CFCFE6-CD58-4502-9D87-37283C44BC00.jpeg