MarcNotMarkI too ordered back in March, do you know if yours has the updated magnetic feet? Your serial# is quite a bit higher than mine, and a different format, so I'm wondering if you got old stock and I got new.
FireyeWoah! If you go on youtube, you'll see a lot of people who bought the ctrl keyboard last year have a serial number of 4 digits. Did you place your order in March, 2019?
MarcNotMarkSure did, "Fri, Mar 8, 12:14 PM". I'm thinking that when they reordered from the manufacturer with the new magnetic feet, a new model# was issued, 30377. That would explain the re-start of the serial numbers. It could be that they had additional new-model feet manufactured as well, which let them retrofit some of the existing models.
Not sure if it matters, but it was the Cherry MX Brown SKU.
FireyeThat's a pretty solid explanation on the modal# and serial#. I ordered slightly earlier than you did and it was Halo true with keycaps. Everything about the keyboard is good so far except the shine-through legends on the keycaps sucked. I never ordered the older version so I really can't tell the differences if there are any.