Congrats. All correct, condition can be argued as always.
The bezel with the "horizontial 1" is no. 3 on the 2. generation SM300's (#B3 in the guide to be;-)... and it is actually quite common. Seen on '66/'67 productions, typically with serial 24x, so you are all good on that one ;-)
Mine (on the right) says heello...
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