Two packages arrived yesterday. One contained a genuine Tropic 21. The other package was from Otto Frei. Among other things, it contained a Sternkreuz XS 306.449 T21 replacement (as seen in Skeet & Urul's "Vintage Rolex Sports Models"!). I still have the Clark T21 that was previously installed in my DW 6263, so I figured this would be a good opportunity to compare the three. Note that the Clark T21 is heavily scuffed around the base, since it had to be trimmed to fit in the DW bezel