One with (top) and another without (bottom). (Thanks to Groover for the picture above)
Usage and differences in the Breitling B-1's crown
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On the Breitling B-1, the crown is used:
It is non-screw locked, and uses two gaskets for water resistance.
Most later B-1 models have a “B” on the crown, and most older don't. It is difficult to determine when these started to be on all models.
One with (top) and another without (bottom). (Thanks to Groover for the picture above)
Here is a table of the presence/absence of logos on crowns, depending on serial numbers and other information. There does not seem to be a clear rationale behind that… is there?
| Reference number | Serial number | Has a B on the crown? |
|---|---|---|
| A68062 (Blue) | 06xx | No |
| A68062 (Gray) | 28xx | No |
| A68062 (Gray) | 39xx | No |
| A68362 (Blue) | 1070xx | No |
| A68362 (Black) | 1135xx | No |
| A68362 (Black) | 1172xx | No |
| A68362 (Gray) | 1200xx | No |
| A68362 (Black) | 1203xx | Yes |
| A68362 (Black) | 1205xx | Yes |
| A68362 (Blue) | 2963xx | No |
| A68362 (Blue) | 2871xx | No |
| A68362 (Black) | 2966xx | No |
| A68362 (Black) | 2996xx | Yes |
| A68362 (Gray) | 304xxx | No |
| A68362 | 302xxx | Yes |
| A68362 (Black) | 3045xx | No |
| A78362 (Blue) | 3405xx | Yes |
| A78362 (Blue) | 3406xx | Yes |
| A78362 (Blue) | 3406xx | No |
| A78362 (Black) | 3406xx | Yes |
| A78362 (Gray) | 3408xx | No |
| A78362 (Gray) | 3414xx | Yes |
| A78362 (Gray) | 3427xx | Yes |
| A78362 (Blue) | 3430xx | Yes |
| A78362 (Blue) | 3438xx | Yes |
| A78362 (Black) | 3441xx | Yes |
| A78362 (Blue) | 3467xx | Yes |
| A78362 (Blue) | 3485xx | Yes |
| A78362 (Black) | 3496xx | Yes |
| A78362 (Black) | 914xxx | Yes |
Many thanks to Abe, Craig, Groover, Jean-Marie, Krasi, Lutz, Mike L., Andrea Manuti, Jean-Luc de F., Simon B., Augustin J. F. and Max L. R. for their help!