eBay seller mlsolar

Misc markings:

Small lettering on the lower left:

OK21.0B0

Large lettering bottom:

6-2807A 8A31099 13

(M)
2005
28079-NN
MICREL

Die @ Mit20x

• Single (5210×6511, 13MB)

  
TCC051
TMC05A
HRES
09X0.5
15X.45

Test pattern @ Mit20x

• Single (2875×2419, 3.7MB)

Looks a lot like GCA Autostep 200 INSITU alignment marks: http://www.cnf.cornell.edu/cnf_process_photo_step_align.html

Downloadable GDS of the alignment patterns are at http://ssel-sched.eecs.umich.edu/wiki/GetFile.aspx?Page=Public.GCA%20AS200%20AutoStep&File=GCA%20Alignment%20Marks.zip.

Not quite identical, though - the AS200 has ten lines in each set and this one looks more like 15. The AS200 pattern also omits the central cross. Perhaps another GCA stepper with a slightly different firmware version?